Home made christmas tree light bottom heat seed mats utilize +/- 6 watts/foot;
lay indoor/outdoor lines in sand or on tile for safety.

Hello,
I have been using farmtek for 5 years, and only had an issue with a product. They gave me a full refund. I have only good luck with these folks.
Steven

Thanks for the info, Steven. I think I'll go ahead and go with them then. They have other things I'll eventually be buying, so this will be a nice "test run" of their service.

Thanks also, GringoJay, for the info on Christmas lights. I'd thought about using those, but don't have many extras ~ certainly not enough to do the area I need to cover. I'd also read about rope lights done that way, but the cost would be about the same once you buy all the fittings to hook them up to a plug-in setup and factor in the pita-ness of having to do that. And having splices in electrical wires in a greenhouse does give me pause... Might try it still, but will get my electrician friend's help to do the splicing.

If anyone else has anything to add, please do!

For years I have used an old electric blanket folded twice,
covered with plastic sheeting, to start my vegetable and
cut flower transplants. Using a soil thermometer, you can
adjust the thermostat to get the desired temperature. It will
hold several 1020 trays.
Try it!! Works for me.
Bud

You know, Bud, for years I'd thought about doing that, but chickened out because of all the wet conditions in the greenhouse (water + electricity = a very nervous me). But just now it hit me ~ they must be made to take atleast some moisture so kids wouldn't get electrocuted if they wet the bed, right? I just might try that after all if I run out of room and have a "rooting emergency". ;) Thanks for the tip.

I'm too chicken to try anything not made for this, but I was just about to order the soil cable from FarmTek, I just wasn't sure of what length, etc. Let us know how they work for you, I have some dream of a red tomato in June, something you probably don't have to dream about in zone 8

Mini Christmas lights have worked for me. I have a grow rack that has 2 strands per shelf and I don't even notice an increase on the electric bill.

Here is a link that might be useful: The Pepper Guy's Garden

use a water bed heater