Heating for small greenhouse

[Palmy]

If possible, I would like to purchase a smalle heater for a greehouse so I can keep things warm during the night. Whats the best one, if there is one, and any idea how much more this will cost? Thanks.

Also anybody else do this?

[BS Man about Palms]

Still stand by plugging in a halogen light overnight...It worked in my small place.

[Neofolis]

It does depend a lot on the size and type of the greenhouse and how much you need to be able to increase the temperature.  My 12' x 8' polytunnel has two covers now, as well as bubble insulation and the 4kW gas heater and 400w metal hallide lamp combined can heat it up to over 40°C/104°F with an outside temperature of 10°C/50°F and high wind, thankfully the termostat on the heater stops it getting that hot.

[BobbyinNY]

I use several different heaters for my (3) greenhouse enclosures.. all electric... A typical 1500-watt, 110-volt space heater will give you about 5200btu's. Depending on the size & insulation of your structure, it should provide anywhere from 10-25f of added heat.  In a typical 6x10 structure you should get about 15f over the outdoor temp. A decent heater with a thermostat will run you about $40.00. While electricity is the most expensive way to heat, I prefer it way over gas or any type of fuel as it's extremely safe and easy to set up.   If you need more heat, you can just add another one. Making sure they are on thermostats is definitely the way to go to reduce costs.

Hope this helps Palmy

[cryptobionic]

Also using halogen here. A tripod holding two lamps containing a 500w and 250w in each. You can find them for about 50 dollars. Keeps my 8' x 32' greenhouse toasty on frigid nights. Never had a problem in the last three years, and the plants closest to it grow much faster. Also great for those midnight vampire gardening chores.

[Palmy]

Thanks a bunch. This really helped.