Grow Kits

8 Best Heaters For Grow Tents – Complete Buying Guide

Is cold weather ruining your plants? If so, you are not alone. One of the most challenging parts of cultivating plants is managing the fluctuating temperatures. And while indoor growing provides some level of control, you still need to ensure that the plants are exposed to an ideal temperature range. The good news is that the best heaters for grow tents make this process much easier for growers.

However, heating a grow tent is tricky since it’s not as large as a growing room. With this, you have to be specific with the heater you’re going to buy. This way, you can prevent the plants from drying up due to excessive heat.

To save you and your plants from trouble, here are some of the grow tent heaters that growers trust:

HEATERBRANDEXPERT RATINGCHECK PRICE
 Our Top Pick! 
AC Infinity CLOUDLINE T4
Temperature Controller
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VIVOSUN Seedling Heat Mat
and Digital Thermostat
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GiveBest Portable
Electric Space Heater
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Aikoper Ceramic
Space Heater
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Vornado MVH Vortex
Heater with Thermostat
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Lasko Adjustable
Oscillating Heater
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Honeywell HCE200W
UberHeat Ceramic Heater
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iPower Electric Heater
For Grow Tents
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When to use heaters on grow tents

To be clear, not all indoor growers will need a heater for their tents. It all depends on the location’s weather, the hardiness of the plants, and the amount of warmth needed. Still, for those in colder areas, the following are the reasons why the best heaters for grow tents are handy:

Your room temperature fluctuates. Even if the grow tent is secured indoors, the temperature can still fluctuate frequently. A heater will prevent this from happening so your plants won’t sustain damages.

Your lights aren’t hot enough. On very cold days, your grow lights may not be enough to produce warmth to combat the low temperatures. A grow tent heater is the instant solution for this problem.

You don’t have heat vents. If the room doesn’t have heat vents, you’ll need a portable heater during the winter season. This is to ensure that your plants are safe from freezing. The same goes when your tent is located in a room with no furnace and if there’s no heat coming into the room.

You’re growing less hardy plants. Generally, a temperature lower than 60F is already straining for plants. For example, if you’re growing tomatoes, you need to keep the temperature above 50F. This is why you have to consider the plants you’re cultivating when it comes to the warmth needed.

8 Best Heaters For Grow Tents

OUR #1 CHOICE

OUR TOP PICK: AC Infinity CLOUDLINE T4 Temperature Controller
best heaters for grow tents

Product Name: AC Infinity CLOUDLINE T4 Temperature Controller

Product Description: When it comes to the best heaters for grow tents, I swear by the AC Infinity CLOUDLINE T4. This is an inline duct fan heater that you can use to heat, cool, and regulate the humidity inside your grow tent. It’s also suitable for hydroponics, making it a versatile choice for growers. Unlike other heaters, this has an inline duct fan that ventilates the grow tent. It uses the state-of-the-art Electronically Commutated (EC) motor that guarantees on-point heating and cooling. This motor allows the device to run quietly and use less electricity. Aside from the duct fan heater, you’ll also receive a programmable controller. Here, you can set the temperature and humidity level that you desire. It comes with sensors on its 12-foot corded probe.

Offer price: $$$

  • Heating Power
  • Controls
  • Safety Features
  • Reliability
  • Value for Money
Overall
4.8

Summary

Moreover, the mixed flow design of this device will ensure peak performance even in high-static environments. This ensures that your plants will receive consistent heat. Also, this T4 series can be linked to another duct fan heater using the same controller. This will give you more airflow or the convenience of using one controller for two separate tents. The only gripe I have over this fan is that when a power outage occurs, it will reset the settings you’ve chosen. So when the power goes back, you need to reset the controller. This can be an issue if you’re not always home. Other than that, the AC Infinity CLOUDLINE T4 remains a great choice for indoor growers.

Pros

Ideal for small grow tents.

Fully programmable controller

You can connect two fans in one controller

Low-noise operation

Plug and play for ease of use

Cons

The settings will go back to default after a power outage.

Not for large grow tents.

You’ll need a bigger unit if you plan to use carbon filters.


RUNNERS-UP

VIVOSUN Seedling Heat Mat and Digital Thermostat

best heaters for grow tents

If you have a small grow tent that needs minimal heat, I highly recommend the VIVOSUN Seedling Heat Mat. You can put it under your pots or on the side to allow the heat to spread in the air. Overall, this emits heat between 40F and 108F. It will let you maintain consistent warmth without the risk of frying your plants dead.

Moreover, this mat has double insulation so that it won’t fry your plants’ roots. It’s also IP67 waterproof, and the outer layer is safe for scrubbing.

The VIVOSUN Seedling Heat Mat is a must-have during the germination period. It will maintain the sweet-spot temperature needed for topnotch growing. It’s also temperature-tested and guaranteed to deliver accurate readings.

Aside from the heat mat, you’ll also receive a thermostat. You can use this to set the temperature on the fly. It’s a basic thermostat, but it gets the job done.

Overall, this seeding heat mat only uses 18 watts and can accommodate a standard 1020 tray. And for this price range, it’s already good value for every dollar.

The only thing growers notice is that the mat comes with a weird scent. I suggest cleaning it first then running it for a few minutes outdoors. This way, you can eliminate the odor before installing it inside the grow tent. Also, I hope they can make the manual more intuitive for first-time growers.

Pros
  • Perfect for germination and low-heat needs
  • Easy to set up
  • It won’t fry the plants’ roots
  • It uses very little electricity
  • Affordable heating mat
Cons
  • It won’t heat your tent for winter (for low-heat purposes only).
  • The mat has a weird smell that you need to aerate first.
  • The controller has a wonky display, but it’s reasonable for the price.

GiveBest Portable Electric Space Heater

best heaters for grow tents

If you’re prepping your grow tents for winter, you should consider the GiveBest Portable Electric Space Heater. While it’s not specifically designed for indoor growing, the reliable heating system of this device makes it the ideal choice for cold days.

This heat runs on 750 watts and 1500 watts settings, which lets you use it as a cool fan and a heater. So whether you’re growing in summer or winter, this space heater will come in handy.

Aside from that, this comes with a thermostat with overheating protection. It will also shut down automatically once the temperature reaches 158F. You can also adjust the temperature setting to suit the need of your plants.

Moreover, this heater has flame-retardant materials to prevent fire hazards. It’s also small and suitable for up to medium-sized grow tents.

This uses a ceramic heating element that heats up fast and operates with low noise. Overall, it can heat up to 200 sq. ft. of area, which makes it ideal when heating grow tents both from the inside and outside.

As a bonus part, I like that built-in handle that makes it easy to transport around. It also has a long 6-foot cord for added convenience.

Take note that while this heater is small, it’s quite powerful. Always pay attention to the temperature range as this heater can still fry your plants if not used well. Also, I recommend that you use a separate thermostat for accurate and on-point readings.

Pros
  • Compact but powerful when it comes to heating
  • Auto shutoff feature
  • Uses ceramic heating element
  • Low noise operation
  • Budget-friendly heater
Cons
  • I suggest you use a separate thermostat for more accurate readings.

Aikoper Ceramic Space Heater

best heaters for grow tents

The Aikoper Ceramic Space Heater is another reliable option for medium to large grow tents. It uses a PTC ceramic heating element that heats up fast and evenly. There’s also a built-in fan inside to spread the hot air inside the grow tent.

Aside from that, this heater can be used in four modes, including a fan only setting. You can set it between 41F to 95F, which is more than enough for most plants. This runs in a 1500-watt motor, which guarantees reliable heating during the coldest winters.

The Aikoper Ceramic Heater has tip protection that shuts the unit down if it gets toppled. It will also turn off once the unit reaches a maximum temperature to prevent overheating.

I like how compact this heater is without compromising its functions. This will easily fit inside a small grow tent without consuming too much space.

However, this heater only has a standard thermostat knob. I suggest using a separate digital thermostat for more accurate temperature monitoring inside your grow tent. Also, this heater has a louder noise level, which can be an issue for some growers.

For this price range, this heater is already a steal for indoor growing. The downsides mentioned above are just small trade-offs that I can live with.

Pros
  • Adjustable temperature range
  • Compact size, perfect for small grow tents
  • Powerful heating element
  • Built-in fan to spread the hot air
Cons
  • This heater is noisier than other units I’ve seen.
  • You need to use a separate digital thermostat for temp readings.

Vornado MVH Vortex Heater with Thermostat

best heaters for grow tents

Are you tired of heaters with a red glow that fries your plants? If so, you should switch to Vornado MVH Vortex. This heater works for up to 1500 watts, which is adjustable in low, medium, and high levels. It also has a cool-touch case that doesn’t emit a red glow that could burn the contents of your grow tent.

Aside from that, this has a shutoff feature that kicks in when the unit is tipped over, or once excessive heat is detected.

At the top area of the unit, there’s a temp knob. But since it doesn’t allow you to choose a specific temperature, you need a separate thermometer when using this heater.

Another thing I like about the Vornado MVH Vortex is its powerful air circulation. It pushes out the hot air, so it spreads evenly throughout the grow tent. The air moves in a spiral pattern (thus, the Vortex name) to create a continuous flow of hot air.

Moreover, this is covered by an unbeatable 5-year warranty, which is something you can’t find on other heaters.

However, one thing you should know is that this heater consumes a lot of electricity. This isn’t surprising considering the heating power of the unit. Nevertheless, this downside is well compensated when it comes to performance and low noise levels.

Pros
  • Covered by a 5-year warranty
  • It doesn’t have a red glow.
  • The case remains cool to touch.
  • It will shut down when tipped off or overheating
  • It uses a spiral air pattern for even heating
Cons
  • It consumes a lot of electricity.

Lasko Adjustable Oscillating Heater

Compact yet a workhorse – this sums up the features of the Lasko Adjustable Oscillating Heater. This unit runs in a 1500-watt motor that can heat up to 300 sq. ft. But since it’s compact, this can easily fit inside your small to large grow tents.

This comes with a thermostat knob, but it doesn’t have a screen that indicates the specific temperature reading. With this, you need a separate thermometer to monitor the heat level of your grow tent.

Moreover, this features a built-in handle and a compact size that only stands at 9 inches. With this, it won’t consume a large space inside your grow tent.

Aside from that, it has safety protection that prevents overheating. The housing also remains cool even if you’re running the unit for long periods.

I also like that it heats very well without being too noisy. It packs a lot of punch when it comes to heating power, though it will also consume a lot of electricity.

However, I noticed that even if you crank down the temp, the fan speed stays the same. It can be an issue for some, but it can be a good thing in spreading the heat and for added ventilation.

Overall, I’m pleased with this heater since it holds up well. However, you should expect a foul odor once you turn this on for the first time. Don’t worry because it will fade after a few hours.

Pros
  • Compact size, ideal for all grow tent sizes
  • Quiet operation
  • It has an oscillating feature to distribute hot air
  • Built-in safety features
  • Built-in handle for added convenience
Cons
  • There’s a foul odor when you turn this on for the first time, but it fades eventually.

Honeywell HCE200W UberHeat Ceramic Heater

Another compact grow tent heater I recommend is the Honeywell HCE200W UberHeat Ceramic Heater. It has a 1,500-watt motor designed for low to high settings. It also has a basic thermostat that allows you to adjust the temp level according to your plants’ needs.

Moreover, this has an overheat protection to prevent damaging your plants. Its cool-touch plastic housing also adds protection as well as tip-over protection. This is also fitted with rubber feet to prevent it from sliding around the grow tent.

The Honeywell HCE200W heater has a soldered ceramic heating element. It uses silicone sleeves for even heat and a longer lifespan. The operation is also very quiet, which is an added feature. I also like its stylish design, which adds value to the purchase.

Just note that the fan works at a single speed and a set angle. Nevertheless, the air circulation is decent and will warm up your grow tents evenly.

As much as this heater is compact, it produces a lot of heat, so you should use a digital thermostat for accurate readings. I also noticed that this heater needs more attention, but it gets the job done just the same.

Pros
  • Tip-over and overheating protection
  • Soldered ceramic heating element
  • Portable and compact design
  • Cool touch plastic housing
  • Equipped with rubber feet
Cons
  • It only works in a single fan speed.
  • It requires more attention when it comes to tweaking the settings.

iPower Electric Heater For Grow Tents

My last pick for this roundup is the iPower Electric Heater. This is made for greenhouses, grow tents, and even home use, thanks to its reliable heating element. It runs in a 1,500-watt motor with the option to turn the heater function off.

Moreover, this unit has an auto-shutoff feature to shut the heating once it reaches the desired temperature. It also heats up fast and can be set at a temperature of up to 210F. It’s more than enough plants cultivated in grow tents.

Aside from that, the housing of this heater has an IPX4 waterproof rating. It’s safe to use even as you’re watering your plants. And since it has a built-in handle, you can easily transport it around. It also comes with a kickstand at a 90-degree angle for optimal airflow and spread of heat. 

Overall, this is a small yet powerful heater that does the job, whether it’s a small grow tent or a greenhouse. However, my only gripe is that the metal screen in front gets rusted over time. Other than that, this offers good value for money for every grower.

Pros
  • 90-degree fan angle
  • A compact but powerful heater
  • Made with greenhouses and grow tents in mind
  • Straightforward controls
  • Equipped with an overheat protection circuit
Cons
  • The fan is slightly weaker than other heaters I’ve tried.
  • The front mesh cover gets rusty over time.

How to choose the best heaters for grow tents

There are many heaters in the market, but not all of them are made equal. You have to be meticulous to find the best heaters for grow tents that suit your plants’ needs. To help narrow down your option, here are the aspects every indoor grower considers:

✔️Heater type

The first thing you have to check is the heater type. This will affect the amount of heat the device can produce. Here are the most common types you can find in the market:

  • Ceramic heaters. These heaters use ceramic stones that get hot quickly. It also cools down quickly, which gives you control over the temperature of your grow tent. But overall, this heater type is only suitable for small to medium tents.
  • Propane heater. Propane heaters use fuel, so it’s a no-no for grow tents. While it heats up fast, it also emits harmful gasses that can be deadly for both you and your plant. You should steer clear of this heater type at all costs.
  • Oil-filled heater. Many growers I’ve met use oil-filled heaters, though it’s not as popular as ceramic types. Also, this heater doesn’t retain heat for long, and it will consume a lot of energy. The upside is that it doesn’t produce harmful gasses as propane heaters do.
  • Hydroponic heater. This is a specialized type of heater used by hydroponic growers. It doesn’t blow hot air; instead, it heats up your liquid solution at an ideal temperature. It uses radiant heat, which can be installed on the roof or floor of the grow room. This is rarely used on grow tents due to the small area.

✔️Wattage and consumption

Aside from the type, you also have to think about the wattage of the heater. This will directly affect its heating prowess, which is very critical during the winter season.

For small grow tents, a low-wattage, you can go for a unit that runs in less than 1,000 watts. However, many growers opt for 1,500-watt heaters as long as it comes with decent controls.

✔️Dimensions

Grow tents are limited in space, so you have to be particular in the physical size of the heater you’re going to buy. Make sure that there’s a distance between the heater and the plants. This is to prevent the device from frying the foliage. In general, the heater size should be directly proportional to the size of your tent.

✔️Stationary vs. oscillating

I highly recommend a heater with an oscillating function. This will help spread the hot air evenly inside your grow tent, so your plants won’t fry from too much heat. It’s also great if the heater can be panned to a specific direction while oscillating.

In the case of stationary heaters, it might be better to use them outside the tent. One technique I use is heating the grow tent from the outside. This may require a bigger heater, but it’s hitting two birds with one stone if you also need to heat up the room.

However, you should check the internal temperature of the tent to ensure that it has the optimal heat level.

✔️Built-in thermostat

Always buy a heater with a built-in thermostat. This will let you monitor the temperature inside the tent while allowing you to set your target heat level. It’s a must to ensure that your plants are receiving the warmth it needs.

In case your preferred heater doesn’t have a thermostat, you should purchase one separately.

✔️Automatic shutoff

Another thing I always look for as much as possible is an auto-shutoff feature. This way, the heater will shut down once the grow tent starts overheating. It will save your plants from excessive heat. Aside from that, it will save you time from having to ‘baby-sit’ the heater all the time.

✔️Value for money

Lastly, always consider the value for money of the heater. For grow tents, you can easily find small and affordable heaters that can do the job. However, you should ensure that it does the job well despite the lower cost.

In the long run, using a dirt-cheap heater may do more harm than good. So if you’re serious about indoor growing, you should invest in your equipment.

My secrets to keep grow tents warm during winter

If you’re living in a place that gets harsh winters, it can be challenging to keep your grow tents warm. So aside from using heaters, you can also try the following tips:

  • Keep your grow tent insulated. You can find grow tents with insulated walls to trap the heat inside. This is very helpful on cold days and when room temperature tends to fluctuate. Take note that insulation also means putting a rug on the floor or wrapping your pots in aluminum foil. This way, the cold temperature from the floor won’t get into the soil.
  • Choose the right grow lights. HID or High-Density Discharge lights produce more heat than fluorescent types. This is a better option if your plants need more warmth and if you’re in the middle of winter. You should also install more lights for added heat.
  • Mind your plants’ nutrients. When supplementing your plants with nutrients, you must keep the solution temperature between 60F and 70F. This will prevent shock as plants can’t absorb nutrients well if the solution is too cold.
  • Always use a thermostat. Whether you’re using a heater or not, you should have a thermostat inside your grow tent. As much as low temperatures are harmful to plants, too much heat is also a no-no.
  • Keep the tent ventilated. Although you’d want to trap heat during winter, you still need to observe proper ventilation in your tents. This is to prevent molds and fungi from forming and damaging your plants.
  • Place the heater in the tent properly. Placing is crucial when using a heater in your grow tent. Consider placing the heater at the middle end of the tent so that the heat will be spread out as evenly as possible. Never point a heater directly to a plant, as this will surely kill it.

Additional grow tent heating hacks

As much as we need to keep the grow tent warm, it’s easy to overdo it at times. This will lead to excessive heat, which will be as damaging to plants as cold shock. Here are some tips to prevent this from happening:

  • Never grow without a thermostat. I can’t say this enough: a thermostat, thermometer, or hygrometer is a must! You should never measure heat level based on your ‘gut feel’. For the best growth and harvest, you have to be on point with temperature.
  • Mind the location of your tent. Hot air rises, so if you set up your grow tent on the second story of your home, it will get more heat. And if you need to reduce the heat, you can bring the grow tent downstairs.
  • Timing is crucial. Heat can be challenging to deal with, so it’s best to time your cultivation according to season. For example, if you want to avoid heat excess heat during flowering, you should germinate your seeds mid-summer. This way, your plants are on time to flower in winter.

Frequently Asked Questions

Q: Is it safe to put a heater inside my grow tent?

A: The answer to this depends on the amount of heat you need. But since grow tents are small and have a reflective lining, putting the heater inside increases the risk of overheating. Still, it depends on the temperature in your location and the plant you’re cultivating. Just make sure that you set the heater temperature properly to avoid problems.

Q: How cold is too cold for hydroponics?

A: Usually, a temperature lower than 60F is already too cold for hydroponics. When the nutrient solution dips below this range, your plants will experience metabolic decline, which will affect their growth. If the cold condition persists, your plants and harvest will be stunted.

Q: How warm should my tent be?

A: The ideal temperature for a grow tent is between 75F and 85F. Depending on your plant’s needs, this temperature level is a sliding scale. But most of the time, it won’t be lower than 60F as it’s already too cold for most indoor-grown vegetation.

Q: Can plants recover from the cold shock?

A: Most plants will recover from cold shock if you manage to warm them up right away. It’s like when you’re exposed to very cold temperatures. You’ll soon stop shivering and recover when you finally enter a warm room. However, if you keep on staying in the freezing cold, you can get hypothermia and die. This is the same with plants.

Q: How can I reduce the heat in my grow tent?

A: If the temperature in your grow tent is too high, you can reduce it by running an oscillating fan. This is suitable if the heater is placed inside the tent. However, if you’re heating the tent from the outside, cranking down the heater’s temperature will be the instant solution.

Final words

The best heaters for grow tents will ensure that your plants are receiving ample warmth for optimal growth. It’s a handy device that you’ll surely need once the winter season kicks in. Paired with a reliable thermostat, you can easily beat the freezing temperatures without damaging your foliage.

What do you think of these grow tent heaters? Share your thoughts below!

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