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Replace 3.5 ton Split System Heat Pump

Posted by RoosterEmerson (My Page) on
Tue, Mar 29, 11 at 8:27

I have a 1790 sq ft home with a 3.5 ton split system. Air flow efficiency is 96%. Outside unit has coil leak and air handler is 28 years old. We are located on the NC/SC state line and five miles from the ocean.

So far I have three estimates and like the Goodman 3.5 ton 15 SEER (Qualifies for our Electric Company 5% loan). The SSZ140421A / ASPF426016B is equipment recommended and am curious why the AEPF426016 variable speed air handler was not suggested, there is only about 4% difference in price to get variable speed.

What are the benefits, single versus variable. Wouldn't the variable help increase the HSPF? Also curious about a thermosat that will max the efficiencty of the system. Last item, Should it have a TXV valve?

Advance thanx for any input.


Follow-Up Postings:

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RE: Replace 3.5 ton Split System Heat Pump

Should have the AEPF, TXV and at minimum the Honywell VisionPro Thermostat for proper control.

AEPF426016C+TXV mated with the SSZ14042 is 15.0 SEER, 13.0 EER, 9.0 HSPF, ARI Ref # 1492630

Also, how did they come to the determination of the 3.5 ton sizing? Did they perform a proper Manual J heat loss/gain analysis?


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RE: Replace 3.5 ton Split System Heat Pump

not a fan of Goodman and especially not in a coastal location.

like Seaton mentions, I would get a load calculation performed for correct sizing.

IMO


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RE: Replace 3.5 ton Split System Heat Pump

They measured every room and window and added sun tracking and exposure and it was plotted on a computer program. They also read every vent and the return for air flow.

Should it be more or less then 3.5 tons?


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RE: Replace 3.5 ton Split System Heat Pump

Normally I would say 'less'. but it depends on the amount of insulation in the roof/walls and how many of what type windows.

Variable speed will help with humidity removal in your climate.


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RE: Replace 3.5 ton Split System Heat Pump

They did measure insulation, the great room has a cathederal ceiling with two skylights that I made storm units for and are fitted at the ceiling opening. There are not a lot of windows and they are old thermapane, 1983.


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RE: Replace 3.5 ton Split System Heat Pump

Sounds like the company did a very thorough analysis of your home and existing system/ductwork.


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