Thank you for your help. No, don't think we had this calculation done. Is this something an HVAC person would do? Also, I don't know all about the construction of a mobile home but if we tie in the new duct to the old one, would we not be pushing the new duct through insulation and possibly have ins...

Hi, we replaced the A/C in our SW home last year. Went from I think a 1.5 or 2.0 ton unit to a 3.0 heat pump (we have about 1100 sf). Even with the increase sized unit, we are still not able to keep house cool enough. Especially the livingroom and kitchen areas. These rooms have higher ceiling and a...