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QUESTION:I am replacing a 30 year old furnace and have had some conflicting
recommendations from heating contractors, maybe you guys could help.
House is bi-level, 2000 square feet, brick on block located in Salt Lake
City Utah, good insulation in ceiling, none in walls.
Current setup:
120,000 btu furnace American Standard, 3 ton Whirlpool Power Guard AC
Contractor 1 said a bi-level house should NOT have a 2 stage furnace because
when running in the lower stage all the heat will be forced upstairs.
Recommends a singal stage 100,000 btu, keep existing AC until it breaks.
Contractor 2 recommends 2 stage 100,000 btu, thinks contractor one is wrong
about bi-level house. Also thinks should replace AC. I asked about only
replacing the AC coils, in furnace ducting, and upgrading the compressor
later. He said, "No, you will contaminate the new coils with dirty freon".
He thinks might as well replace AC coils now as will be a major pain,
expense, later.
Contractor 3 recommends 2 stage 100,000 btu. Never heard about contaminating
a new AC coil when paired with an old AC compressor.
So the questions are:
Should a bi-level house have a 2 stage furnace installed?
Can you hurt a new AC coil by running it with an old AC compressor?
ANSWER: You do not need a 2 stage. The structure is not that tall. As far as
contaminating a new coil with bad freon, the man is an idiot. In order to replace
a coil, the system should be pumped down, recovered, and either replaced or put
back in the system. These are EPA regulations. If the compressor did not burn
out, and the install is done properly, then there will be no contamination to
consider. These guys will do anything to install a WHOLE new system. The
manufacturer they buy from puts pressure on them to install more new units. If
you want a new unit, fine, but it doesn't sound like you need one.
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