Okay, so we are getting a new HVAC system. We have a 170yr old 1200 sq.ft 1.5 storey farm house with R11 walls, R30 roof and new windows and doors (well sealed) there are no drafty spots either. We are adding 650sq.ft addition that will have R24walls and R40 roof We have had quotes ranging from high efficiency furnace size of 75,000btu and AC - 2 ton to high efficiency 90,000 btu and AC 2.5 ton We live in an area with temps down to 10F and up to 90F as the norms (south central Ontario, Canada) My question is what size is right? Also manufacturers - how do the likes of Keeprite/ Tempstar compare to Rheem/Ruud? Thank in advance for the help.

I recently had my upstairs heat pump stop cooling. The house is covered under a home warrantee from AHS so they sent a guy out. After having to defrost the system he comes back and determines that the inside coil is leaking and that the reason is that the outside coil is dirty. Now a little back ground. The inside unit is roughly 14 years old. The outside unit is 4 years old. So he writes it up and submits it to AHS. We hear today that AHS is denying our claim due to neglegents. That is funny since we have only been in the house since Febuary. So the question is this. Can a dirty outside unit cause the inside coil to leak? Is this just some way for the warrantee company to get out of the repair? Is there anything I can do about it? Also, where is a good place to go to learn about cleaning the outside coil? We have another tech coming tomorrow for a second opinion, I will be d**ned if that outside unit is still dirty when he gets there. Thanks for the help. Russell