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03-13-2009, 02:54 PM #1
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Single Stage Heat/Dual Stage Cool
Hi! Just a quick question. Two years ago I had a single stage/multiple speed 80% furnace installed (Coleman G8C). I am thinking of upgrading the cooling this year. Is it possible to get a 2 stage cooling system to work with this furnace? I know I would at least have to get a 2 stage thermostat. I thought maybe there was a way since the furnace has multiple speeds. Thanks!
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03-13-2009, 03:07 PM #2
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If by saying multi-speed you mean variable speed, then you should be able to do it. I have a feeling you don't have a variable speed due to it being a single stage furnace. I'm not familiar with Coleman, so who knows for sure.
I like DIY'ers. They pay better to fix.
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03-13-2009, 03:40 PM #3
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The "multi-speed" refers to the air handler fan motor.
Originally Posted by jclaar
You can get a 2-stage condenser and a matching indoor coil, but you really need a variable speed air handler motor to get the best efficiency out of that 2-stage condenser. If you don't have a v-s motor, I wouldn't go any higher than a 14 SEER system because you won't obtain the higher SEER rating without a v-s motor.
Good luck.
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03-13-2009, 03:53 PM #4
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Okay. Thanks for the fast replies!
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03-13-2009, 03:54 PM #5
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if you wanted to use a 2 stage unit adding a relay to control fan speed would be easy to do.
would not get the rating of a v drive blower but it would work.
can't go into details but contractor should know how to do it.
we had 2 stage units a long time before we had v drive blowers.
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03-13-2009, 03:58 PM #6
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Great! I thought I read somewhere else about relays. Thanks again. Also, are the media filters worth the extra money? (hijacking my own thread!)
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03-13-2009, 05:03 PM #7
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Yes they are, if the duct work is sized right.
Your multispeed won't slow down enough to take full advantage of 2 stage cooling.
It won't have the full ability to remove humidity in first stage cooling.
How ever.
You can either have a fan speed control installed, or a VS motor upgrade installed.
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