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Key Takeaways

Best Overall

Best Bang for the Buck

Best Gas

Best for Small Areas

Best for Large Areas

Best Ceiling-Mounted

Best Wall-Mounted

Best Seed Tray Heater

How We Tested the Best Greenhouse Heaters

Our Testing Scores

What to Consider When Choosing a Greenhouse Heater

Tips for Keeping a Greenhouse Warm

FAQs

Meet the Tester

The most glaring difference between a greenhouse and a high tunnel or cold frame is the greenhouse heater. Where cold frames and high tunnels extend the gardening season and protect plants that are marginally hardy for the local climate, adding a heater can make it possible to keep tender plants alive in cold climates.

But to choose the right one, you need to consider its design, size, and power source alongside your local climate.…