so i have my growtent in a room that has no a/c or heat in it, pretty much just a concrete room off to the side. its about 5sq feet and i have a 250w Mh in it. im keeping the light on 24/7 right now b/c i just planted the seeds on the 26th and they just sprouted yesterday. my problem is at night, it hits about 60 in my growtent at the coldest point(so far) and its about 80-83 at the hottest point. what can i do to keep my temps up?
i like the cheap heaters at any big box retailer. if you get one with bright LEDs or a backlit readout, you may have mask it...the light from the LEDs in an otherwise dark room, may be enougth candlepower to mess off your flower cycle.
another option, since you have a relatively small space to heat: ceramic heat emitters...
http://www.villagepetoutfitters.com/product.asp?pid=58&cat=3
and
http://www.animalworldnetwork.com/hewala60wceh.html
are just a couple of examples of the idea of radiant heat, w/o the light. And these links are just to illustrate, not point you to the best deal/brand/site.
You'll want to use them with a ceramic socket, just to be safe. The socket I have has a dimmer, which would essentially be a way to dial down the temp.
It's not as sexy as a new, super efficient heater with a digital readout, timer, thermostat, and whatever...but it will keep you warm and dark.
I'm pretty sure you can get them in higher wattages than just 60.
Be well.