My Grow Tent is in an upper loft area in my garage. My garage is climate controlled, except that space is 1000 sq ft and is part two story (loft area).
Meaning, I am too cheap to heat it much more than 66ºF in winter.''
The lights keep the tent plenty warm. In fact, I pump that nice 66º air into my tent to maintain the mid-70s during lights on. My issue is during lights out.
My passive radiant heater (posted earlier about it) works perfectly. Although, so did the oil-filled radiator. I just wanted to free up some floor space.
Over in the UK, they have these things called:
"Ultra Flat Grow Room Heater"
These are perfect for a grow tent, but I can find U.S. or Canada-compatible versions over here. They kind of work like the defroster in the back windshield of cars.
They only heat to 65ºF, but I bet that would be perfect for some folks who get pretty cold at lights out. I looked at having one shipped over here (they weigh less than a pound in weight (360g)), but they run on 220v.
Here is what they look like:
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Here is the products propaganda:
ULTRA FLAT GROW ROOM HEATER
This perfectly flat, ultra-light heater can be easily suspended by a single hook. This heater makes keeping a consistent environment simple – protecting plants from sudden temperature drops and humidity fluctuations and can be used in almost any environment. It can be rolled up for easy storage and transportation. A built-in economical stabiliser maintains the temperature at 65°. This heating system reproduces the effects of the sun for flowers and plants without burning oxygen.
KEY VALUES:
- Flat & ultra-light
- Humidity resistant
- Can be rolled up for easy storage and transportation
- Built-in stabiliser
- Warm-up within 10 sec
SPECIFICATION:
- Voltage: 220-250 V
- Heats room up to 15m2
- Consumption: 0.5 kw/h
- Working temperature: 65°
- Life expectancy: 10 years
- Weight: 360gr
- Thickness: 0.12mm
- Dimensions of deployed radiator: 1200 x 580 [mm]
- Packaging dimensions: 600 x 65 x 65 [mm]
- Warm-up time: 10 sec