Best Greenhouse Heater with Thermostat

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Keeping your greenhouse warm is essential—but keeping it consistently warm is the real game-changer. That’s where a greenhouse heater with a built-in thermostat makes all the difference. Instead of constantly checking and adjusting, you let the heater do the work—automatically maintaining your desired temperature so your plants stay healthy, productive, and protected.

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In this guide, we’ll cover the best greenhouse heaters with thermostats in 2025, ranging from compact electric models to powerful gas-powered systems. Whether you’re growing seedlings or overwintering tropicals, these heaters are set-it-and-forget-it solutions built for serious growers.

Why You Need a Heater with a Thermostat

A standard heater will warm the air—but without a thermostat, you’re stuck guessing how hot it is or when to turn it off. Here’s what you gain with a thermostat-controlled greenhouse heater:

  • Consistent temperatures (ideal for sensitive plants)

  • Energy efficiency (saves money by cycling on/off)

  • Peace of mind (no more overheating)

  • Better growth (plants thrive in stable conditions)

Whether your greenhouse is small or large, thermostats put you in full control—without hovering over a thermometer all day.

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Best Overall Greenhouse Heater with Thermostat

Bio Green PAL 2.0/US Palma Greenhouse Heater

Best for: Most backyard and small-to-mid-sized greenhouses

Direct answer: The Bio Green PAL 2.0 is the best overall thermostat-controlled greenhouse heater, offering precision, durability, and energy efficiency in one compact unit.

Top features:

  • Stainless steel housing—rust- and corrosion-resistant

  • Built-in digital thermostat from 32°F to 100°F

  • Adjustable fan and heat settings

  • Splash-proof design (IPX4 rated for humid environments)

  • Can heat up to 120 sq. ft. effectively

What sets this model apart is the accurate thermostat control paired with safety features like overheat protection and an energy-efficient fan mode.

Power source: Electric (1500W, 120V)
Price range: $150–$200

Best Budget Heater with Thermostat

Dr. Heater DR218-1500W Greenhouse Heater

Best for: Budget-conscious growers needing thermostat precision

Direct answer: The Dr. Heater DR218 is the most affordable thermostat-controlled heater built specifically for greenhouse use.

Why it works:

  • 1500-watt power output

  • Adjustable thermostat dial (not digital, but very accurate)

  • IPX4 water resistance

  • Rugged, industrial steel casing

  • Fan-forced for even heat distribution

This unit gives you reliable heat and basic control without unnecessary frills—perfect for users who want plug-and-play performance on a budget.

Power source: Electric
Price range: $100–$140

Best Propane Greenhouse Heater with Thermostat

Mr. Heater Big Buddy Propane Heater + Thermostat Adapter

Best for: Off-grid or large non-electric setups

Direct answer: The Mr. Heater Big Buddy becomes a powerful thermostat-controlled propane heater when paired with an external thermostat controller like the Thermo Cube or Inkbird ITC-308.

Why it’s great:

  • Dual ceramic burners with 4,000–18,000 BTU range

  • Can heat up to 450 sq. ft.

  • Built-in tip-over shutoff and ODS (Oxygen Depletion Sensor)

  • Thermostat control possible with smart plug/thermostat combo

While it doesn’t have an internal thermostat, it works seamlessly with external controllers, giving you a powerful off-grid solution with automatic heat cycling.

Power source: Propane
Price range: $120–$160 (heater only)
Add ~$40–$60 for thermostat controller

Best Thermostat Heater for Large Greenhouses

Dyna-Glo Deluxe 50K–80K BTU Forced Air Heater

Best for: Large-scale or commercial greenhouses

Direct answer: The Dyna-Glo Deluxe offers high BTU output and can be controlled via an external thermostat for heating larger greenhouse spaces.

Key benefits:

  • 50,000 to 80,000 BTU output—heats up to 1,900 sq. ft.

  • Continuously variable heat adjustment

  • Compatible with external thermostats (manual plug-in)

  • Includes regulator and hose for propane tank

It’s not plug-and-play like smaller electric models, but if you’re managing a big growing space, this heater offers unmatched heat output and reliability with thermostat pairing.

Power source: Propane
Price range: $220–$300

Best Smart Greenhouse Heater with Thermostat

Heat Storm Phoenix Infrared Heater + WiFi Thermostat Control

Best for: Growers who want app-based control

Direct answer: The Heat Storm Phoenix combines infrared heat with WiFi thermostat control, letting you monitor and adjust your greenhouse temperature from your phone.

What makes it smart:

  • 1,500W infrared heating (efficient and silent)

  • Built-in WiFi-enabled digital thermostat

  • Wall or freestanding mounting options

  • Remote control via app

While it’s not water-resistant, this heater is perfect for insulated greenhouses or areas with drier conditions. The WiFi control is a game-changer for remote management.

Power source: Electric
Price range: $150–$180

Comparison Table: Best Greenhouse Heaters with Thermostat

Heater Name Best For Power Source Heating Capacity Thermostat Type Price Range
Bio Green PAL 2.0 Overall performance Electric Up to 120 sq. ft. Built-in digital $150–$200
Dr. Heater DR218 Budget users Electric Up to 150 sq. ft. Manual dial $100–$140
Mr. Heater Big Buddy + Thermo Off-grid large setups Propane Up to 450 sq. ft. External (smart plug) $160–$220
Dyna-Glo Deluxe Large/commercial space Propane Up to 1,900 sq. ft. External compatible $220–$300
Heat Storm Phoenix Smart app control Electric Up to 150 sq. ft. WiFi digital thermostat $150–$180

What to Consider When Choosing a Greenhouse Heater with Thermostat

1. Greenhouse Size

  • Up to 150 sq. ft.: A 1500W electric heater will do the job.

  • 150–500 sq. ft.: Consider propane models with 4,000–18,000 BTU.

  • 500 sq. ft.+: You’ll need high-output heaters (50,000+ BTUs).

2. Power Source

  • Electric: Cleaner and easier to control but needs reliable power.

  • Propane: Better for large spaces or off-grid use, requires proper ventilation.

3. Thermostat Type

  • Built-in thermostats offer simplicity.

  • External thermostats offer more flexibility and precision.

  • Smart thermostats allow remote or app-based adjustments.

4. Weather Resistance

  • Look for IPX-rated heaters if your greenhouse has moisture or condensation.

  • Non-waterproof units should be elevated or enclosed in dry areas.

5. Ventilation

  • Especially for propane heaters—ventilation is essential for safe operation.

  • Circulation fans help maintain even temperatures and prevent hotspots.

Conclusion: Heat Your Greenhouse the Smart Way

The right heater with a thermostat can turn your greenhouse into a controlled growing environment—no matter what the weather throws at you. You’ll protect your plants, improve yields, and stop wasting energy on guesswork.

Top picks recap:

  • Best overall: Bio Green PAL 2.0 Palma

  • Best budget option: Dr. Heater DR218

  • Best propane setup: Mr. Heater Big Buddy + smart thermostat

  • Best large greenhouse heater: Dyna-Glo Deluxe

  • Best smart control: Heat Storm Phoenix

Still unsure which heater fits your space? Drop your greenhouse size or climate conditions in the comments—I’ll help you find the ideal match. Let’s keep your plants thriving and your greenhouse toasty, all year long

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