The Heater Ran All Night. The Lemon Tree Died Anyway.
Five reasons gardeners are carrying the house heater back inside this winter, and plugging in one that reads the temperature beside their plants and holds it until morning.
You Did Everything Right. The Heater Was Still On When You Found It.
You heard the forecast and did the responsible thing. Carried the spare heater out from the den, ran the cord, turned it up, and went to bed thinking the lemon tree was covered.
Then the morning. Leaves gone dark and glassy. Little green lemons on the floor around the pot. And the heater, still sitting right there, still plugged in.
That's the part that stings: you didn't forget. You protected it, and it died anyway. But the tree wasn't lost because you did something wrong. It was lost because that heater was built for a completely different job.
A House Heater Is Built to Warm People. Your Plants Aren't People.
A living-room heater assumes someone is sitting near it. It's built for an insulated room with walls that hold heat, not a glass box that dumps it the second the sun goes down.
Look at the dial: MIN to MAX. No number on it. So there's no way to tell it "keep the tree above 40." And if it has a sensor at all, it's reading the air right at the heater, the warmest spot in the greenhouse, while the pot by the glass sits several degrees colder.
Plenty of house heaters also carry auto-off timers built for bedrooms. Great when you're asleep in the next room. Not great when the coldest hour of the night comes after the timer has already clicked off.
| What the plant needs | House heater | FrostGuard |
|---|---|---|
| A temperature it never drops below | MIN–MAX dial, no number | Set 40–108°F on a digital display |
| A reading where the plant is | At the heater, if anywhere | Probe in the soil beside the roots |
| Heat at 5am, the coldest hour | Only if you got up to check | Fires on its own, every time |
Set It Once. You'll Never Have to Check the Greenhouse Again.
FrostGuard ships with a digital thermostat and a temperature probe on a cable. Push the probe into the soil beside the plant you're most worried about. Set your number. That's the whole setup. Here's the night now:
| Time | Greenhouse | You |
|---|---|---|
| 9 pm | Probe reads 50. Heater waiting. | On the couch. |
| 2 am | Drops below 45. Heater fires. | Asleep. |
| 2:20 am | Back to 45. Shuts off. | Asleep. |
| 5 am | Coldest hour. Fires again, as often as it takes. | Asleep. |
| 7 am | Sun's up. Heater rests. | Coffee by the lemon tree. |
No more flashlight walks. No more guessing. The display shows the live reading at the roots and lights up whenever it's calling for heat, so one glance from the door tells you everything.
Comfortable, Not Cooked. And No Open Flame Next to the Bench.
Blasting a heater on MAX all night isn't protection either. It cooks the seedlings nearest to it while the far corner still freezes. FrostGuard holds a floor: it only adds heat until the probe reads your number, then stops. Warm enough for the lemon tree, without turning the whole greenhouse into a sauna.
And the thing every greenhouse owner thinks about at night: what's running out there while I sleep? FrostGuard heats with a PTC ceramic element behind a steel grille. No flame, no fuel to refill, overheat protection built in, and it's ETL listed.
Treat it like any 1500W appliance and it'll treat you right: set it on a dry bench or a paver, not the wet floor, keep it clear of anything that can fall on it, and never cover it.
Don't Take Our Word for It. Point a Thermometer at It.
Plug it in, and the ceramic element is up to heat in about 3 seconds. Hold your hand at the grille, or aim an infrared thermometer at it and watch the reading climb. Then tilt the stand to aim the heat straight at the bench that worries you most.
$79.95 during the Fall Sale, down from $159.90, with free shipping. That's the heater, the thermostat and the probe. Less than replacing one established citrus tree, and a lot less than replacing years of growing it.
Sized honestly: it's made for a small hobby greenhouse, a lean-to, a sunroom or a grow tent. Bigger or single-wall spaces need two units, two probes, two numbers.
A 1500W PTC ceramic greenhouse heater that ships with a digital thermostat and probe. It reads the temperature beside your plants all night and holds the number you set, so the tree you've spent years growing makes it to spring.
Why 50% off? It's our Fall Sale, priced for growers who want the probe in the pot and the number set before the first frost warning, not the morning after it.
$79.95 during the Fall Sale, half off with free shipping and 30 days to change your mind. A probe at the roots, a number you set once, and a heater built for a greenhouse, not a living room.
Get FrostGuard — 50% Off →