Help with Heat Pump selection.

ciscovpnMarch 19, 2012

I'm in the process of getting quotes for a new Heat Pump for our house in the washington dc area which we just purchased. The house is 12 yrs old, dual zoned. The upper level zone is an attic mounted heat-pump. About 1300 sf.

The local contractors are proposing the following systems (all single stage - variable speed AH):

  1. Trane 4TWX5030A1 TAM7A0B36H31 $6300 - $700 rebate

($6600 - $700 rebate if it includes 10 year labor.)

2. Trane 4TWX5030A1 TAM7A0B30H21 $5980 - $500 rebate

($6605 - $500 rebate if it includes 10 year labor.)

3. Carrier 25HCC530 FV4CNF002 $6240 - $450 rebate

4. Lennox XP14-030 CBX40UHV-36 $6878 - $300 rebate

Do i go with Trane based on the proposals? Does it matter if AH is 2.5 vs 3 ton if outside unit is 2.5ton?

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I think I can answer your 2nd question: No. basically, the 3ton unit can be set (the blower) to a lower speed for the 2.5 coil.

I could look, but are these the Xn15 units being spec'ed?

    Bookmark   March 19, 2012 at 5:45PM
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The trane outside units are both XL15i.

    Bookmark   March 19, 2012 at 5:59PM
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there are three equally important components-quality HVAC, the install by dealer, and probably the most overlooked and disregarded is the ductwork system.

these are my minimum specs for a new HP system. both outside and inside units should be replaced to have a properly matched system.

15 SEER, 12.5+ EER, 9 HSPF
best matching VS air handler
full BTUs in both cooling and heating for your rated size
R-410a refrigerant(same as Puron)
scroll compressor preferred
electronic demand defrost preferred
thermostat with "dehumidify on demand" feature
staged backup heat strips
new and correctly sized refrigerant lineset

you want a thorough inspection of your ductwork system. size, overall condition, supply and return lines, insulation qualities, leak test, etc.

any hot/cold spot issues in your home should be addressed.

I would only use authorized dealers for the various brands that provide quotes. see mfg websites.

I would look at Trane/AmStd,Rheem/Rudd,Carrier/Bryant.

Depending on your location, I would not purchase a new HP system that did not have electronic demand defrost.


    Bookmark   March 20, 2012 at 12:35PM
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