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heating mat

Post  tdnmm on 2/17/2015, 8:32 pm

Hello everyone,
  What can I use under my heating mat to raise the temperature to 85. I have a thermostat but it only gets up to 80. I went to home depot and purchased a thermal insulation board. After reading the label, it said it was combustible so I removed it. Thank you-Tom
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Re: heating mat

Post  quiltbea on 2/17/2015, 9:12 pm

glad you\'re here to the forum.
Why the heck would you want to increase the heat to 85 degrees?  Starting seeds don't need that much heat and once they germinate, they can get by with even lower temps, like in the low- to mid-60s, to give them a spring boost.
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Re: heating mat

Post  boffer on 2/17/2015, 9:35 pm

Welcome to the forum.

I put my heat mats on 1 inch foil faced foam board.  (foil up)  I let the built-in thermostats do the work. I cover the trays with clear plastic covers to keep the heat in. No problems in 8 years.  

I'm as puzzled as QB about the need for higher temps.  There are several charts in the back of the ANSFG book.  The temp points listed in your range are 77° and 86°.  Only a few variety of seeds germinate faster at 86 than 77, and then only by a day or two.  Interestingly, the percentage of seeds that germinate at 77 is better than 86 for nearly all varieties listed.

Is there something out of the ordinary that you're trying to do?
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Re: heating mat

Post  Turan on 2/17/2015, 11:39 pm

The only seeds I find I need extra heat for are peppers.  I used a heat lamp over them as well as the heat mat underneath.  Gotta be very careful then to not dry them out.

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Re: heating mat

Post  sanderson on 2/18/2015, 12:11 am

Tdnmm, Welcome to the Forum from California! glad you\'re here

Are you trying to germinate exotic/tropical seeds? Did someone tell you that you needed 85*F? My thermostat is set 68-72*F and the small warmth of fluorescent tubes is sufficient to germinate veggie, herb and flower seeds. I have the plastic trays on tile flooring so I put a doubled towel under the trays and have the trays doubled up with cardboard between the 2 pans as insulation from the cold floors.

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Re: heating mat

Post  camprn on 2/18/2015, 1:46 pm

Ditto what sanderson said. And you only need that temp for about 24- 48 hours. Also consider you will still get germination at lower temps but it may take a day or two more.

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Re: heating mat

Post  AtlantaMarie on 2/18/2015, 3:22 pm

Hi Tom.  Don't have any heating mats, so can't chime in on that. 

But welcome from Atlanta, GA!
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Re: heating mat

Post  quiltbea on 2/18/2015, 4:18 pm

Camprn........Great chart and from the look of it, the range from 68-77* seems ideal for just about everything.
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Re: heating mat

Post  yolos on 2/18/2015, 5:33 pm

Camprn - just to make sure I have it right, are the temps in that chart soil temps or air temps.
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Re: heating mat

Post  camprn on 2/18/2015, 6:26 pm

@yolos wrote:Camprn - just to make sure I have it right, are the temps in that chart soil temps or air temps.
soil temps

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