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re: Any HVAC Professionals?
Posted on 5/8/19 at 9:49 am to notsince98
Posted on 5/8/19 at 9:49 am to notsince98
I’m going to have to replace my 14 year HVAC system in the next year or 2 so I’ve been “researching” this stuff to death. On face value doesn’t seem a 2.5 ton unit would be oversized for a 1,500 ft2 house in Austin. Installers use to use as a rule of thumb 1 ton per 500 ft2 of living area, and apparently many still do, but in today’s construction of tight houses, using spray foam insulation, etc. I understand 1 ton per 800-1,000 ft2 is not uncommon in a very tight, energy efficient home. The manual J load calculation provides the builder/HVAC installer with sizing information they should be using.
As an aside, I’ve seen multiple post from Austin homeowners on the HVAC-TALK forum. Seems like they have worst heat and humidity problems than we do in southern Louisiana.
Anyway, I know it’s not a funny issue for the OP, hope his problem is an easy fix.
As an aside, I’ve seen multiple post from Austin homeowners on the HVAC-TALK forum. Seems like they have worst heat and humidity problems than we do in southern Louisiana.
Anyway, I know it’s not a funny issue for the OP, hope his problem is an easy fix.
This post was edited on 5/8/19 at 9:56 am
Posted on 5/8/19 at 11:06 am to CrawDude
quote:
I understand 1 ton per 800-1,000 ft2 is not uncommon in a very tight, energy efficient home.
Sometimes it isn't even that much and you don't need spray foam.
I'm a bit further north but our design temp is still fairly high. I have 2,400sq ft above ground level with BIBS (blown in blanket fiberglass) in my walls which gives me R15 and reduces infiltration quite a bit compared to fiberglass batts. That alone got me down to 1.6 tons of cooling load. So I am at about .7 tons per 1000 sq ft.
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