I have carefully run the numbers using the HVAC-Calc Residential program and have the following numbers.
Sensible Gain 19,857
latent Gain 1,827
Total heat gain 21,684
Total Heat loss 34,159
Nashville, TN area
Program says use a 2 ton. I understand this is based on 12,000 BTU's per ton, but what about the heat pumps capacity to heat? Do you size the heat pump just using the heat gain numbers and an AUX heat strip for the high total heat loss btu's?
My home will be an all elec of aprox is 2329 sq ft with 4 1/2" SIP (strucual insulated panels) wall construction. Downstairs is aprox 1500 sq ft, 2nd floor 829 Sq ft. Joists between floors will only be 12 inch in height. Home on 40" sealed and conditioned crawl space. All windows low-e with argon.
I asked 3 companies in the area to give me a quote and design a system for me.
2 recommend a 3 ton zone system with one zone for each floor
1 said a 2 system plan with a 2 1/2 ton for 1st floor and a 1 1/2 for the 2nd.
I don't think any of them really ran a Manual J.
Should I run the 1st floor ducts in the crawl space, and the 2nd floor between the floors? Or try and squeeze them all in the area between floors. Have been given both ways by different contractors. Have learned a lot from the forum, thank you.