converting from 1 to 2 zone heating?


Old 07-04-03, 06:59 PM
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converting from 1 to 2 zone heating?

I'm looking at buying a particular house. It's about 3500 square feet- 2 floors and a basement. The day I looked at it the upstairs was warm and downstairs was cool. It seemed as though there was only 1 zone of heating/cooling since I only saw 1 thermostat. Is this possible for a new home of that size? The owner is out of town and the agent didn't have a clue.
If it is only 1 zone, what is involved in making it 2 or more zones? I saw some advanced thermostats with dampers that do it. Anyone know the cost to put something like that in? I'm trying to come up with an offer but I don't want to buy a house if this would be expensive to fix.
Old 07-04-03, 07:55 PM
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I don't blame him for selling
Unless duct work is accessibe for modification, not likely
It's going to stay hot up and cool down
Even if second system were to be installed in attic with new duct system, the existing system would complicate the load to capacity ratio for the house
hate when the hvac experts promise you the 5 ton monster will handle up and down loads--
now try to get him back out to explain why it doesn't
Old 07-06-03, 10:07 AM
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There would be no problem having a single zone in a two story house if the ductwork and fan were sized properly.

If seriously interested in the house I would have it examined by a mechanical engineer specializing in ductwork who would give you a detailed report on the hvac system.
He would also be able to design a ducting system that he would guarantee would work.

There have been a lot of questions on this topic. Search back posts for more info.

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