Just wanted to know if there is any information regarding York (and subsidiaries) units. We will be getting a quote for a York unit later today. I know from this web site that the installer is key, but also wanted to see if anybody had any recent experience with installations or service?

Also wanted to ask about the HVAC Manual J calc for an addition. We are renovating an attic and adding a HP. the attic will be changed into an approximate 700 - 850 sf master suite and laundry room. Downstairs is 1400 sf. Is it possible to do a Manual J calculation for only an addition or should you do one for the entire house (including addition) and add up the btu's.