Central A/C and wood furnace: can they work together?

  • Active since 1995, Hearth.com is THE place on the internet for free information and advice about wood stoves, pellet stoves and other energy saving equipment.

    We strive to provide opinions, articles, discussions and history related to Hearth Products and in a more general sense, energy issues.

    We promote the EFFICIENT, RESPONSIBLE, CLEAN and SAFE use of all fuels, whether renewable or fossil.
Status
Not open for further replies.

Beno

Member
Feb 26, 2007
175
A while ago I was told NO, because the A/C has a part that is installed in the hot air duct and the wood furnace will damage it because of the high temps. Anybody has a solution? I have the Caddy wood/electric furnace, a single furnace.
Thanks!
 
It's really hard to cool and heat at the same time. Sorry couldn't help myself.
 
It’s really hard to cool and heat at the same time. Sorry couldn’t help myself. -- It's called, hot deck-cold deck VAV
 
When I suggested to put the A/C coil in the return/cold/supply duct I was told that this is a bad idea, because the cold air will cause condensation and rust of the furnace, and I think that this is correct.
 
I Knew what you ment. Just joking around. Don't Know the answer to your question.
 
Beno said:
A while ago I was told NO, because the A/C has a part that is installed in the hot air duct and the wood furnace will damage it because of the high temps. Anybody has a solution? I have the Caddy wood/electric furnace, a single furnace.
Thanks!

I work for PSG, if you have an A coil AC try the following: I'm not sure if the picture will come through but basically place your A coil as high as possible in the plenum that should help. A better install is as per the drawing. Make a parallel plenum to hold the A coil with a 'winter/summer' bypass damper.

The following notes in the manual should also apply:

The main thermostat must be a “heat/cool†type
The PC board of the furnace must be in a COOL mode and the desired distribution blower speed must be programmed (see MODES section for complete instructions).
Upon thermostatic demand for cooling, the distribution blower will start immediately
Place A coil as high as possible in plenum
 

Attachments

  • Untitled.bmp
    125.6 KB · Views: 794
We have done a bunch of these, just putting the slab coil above the A coil. Just put the fan to run on high for heating and it works fine. Assuming you have a modern duct system that is designed for about .01 static. Most are.
 
Status
Not open for further replies.