Replacing furnace and not HVAC?

newtoremodelSeptember 19, 2011

Would there be any problems replacing a furnace but not the A/C? I'm remodeling my house and I'm thinking about moving the furnace into the attic, but I'm told that the existing one (currently in a hallway closet), will need to be replaced. The A/C condensing unit was located on the roof previously, but will get moved to the sideyard. Is there anything in particular that I'll need to be aware of when mixing a new and old system?

Thanks for the advice!

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1. how old is the old AC unit?
2. ARe you moving it (the old one) from the roof to the sideyard?

If #1 is 'over 10 years' and #2 is true, you should replace the old unit considering the costs involved.

    Bookmark   September 20, 2011 at 4:16PM
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Thanks for the help.

I'm not sure how old the AC is, but somewhere around 5-10 years seems about right. It looks to be in pretty good shape. It's an Amana/Goodman, so probably not as expensive as some of the other brands. The cost of moving it to the sideyard and the new ducts/wiring/pipes are already included in the remodeling costs, so that won't play a big factor. I'm just concerned that we might end up with a poorly matched system. I'm getting some bids on replacing the whole HVAC system to see if it's feasible at this time.

    Bookmark   September 21, 2011 at 3:25AM
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Do you have a multi positioning evap coil to put in the attic or is the new setup going to be vertical also?

    Bookmark   September 21, 2011 at 9:10AM
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Moving an old AC condenser is risky. I did this with a 20 year old unit. A freon leak developed after the move. I eventually replaced it with a new unit.

If the budget won't allow a new AC, then consider adding the matching condenser in the Spring. You may also be eligible for the $500 tax credit with a new furnace and condenser, plus local utility rebates.

    Bookmark   September 21, 2011 at 9:25AM
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I don't think I'll have enough vertical space in the attic for the existing furnace, so I'll have to go with a horizontal setup. Does that have any special issues vs a vertical setup?

It's a good suggestion about the condenser, especially since most of the work will be outside the house. I'll look into the rebates but we're already replacing the water heaters and attic insulation, so we may not be able to claim any more credit.


    Bookmark   September 22, 2011 at 4:30PM
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What state are you in? California utilities offer substantial rebates for whole home efficiency projects (covering envelope sealing and system upgrades).

    Bookmark   September 22, 2011 at 6:41PM
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I guess my question did not merit an answer. do you have a multi positioning coil?????? this is very important to the install procedure.

    Bookmark   September 23, 2011 at 9:24AM
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Sorry heat seeker. I don't know what kind of coil I have right now. I was told that I "couldn't" use the existing furnace in the attic because it would have to be placed horizontally. I assumed that meant I don't have a multi positioning furnace and/or evaporator coil. Thanks.

    Bookmark   September 25, 2011 at 4:21AM
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your welcome

    Bookmark   September 26, 2011 at 1:13PM
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