I've done some searching on these forums and got some really good info but it seems every system is really different. I just had a Ducane 13 seer 2 ton condenser installed, I know it's a cheap unit, connected to an old Montgomery Ward 700 furnace. Specs on the furnace say input BTUH 80,000, Bonnet Capacity BTUH 64,000.
The duct work to each room is 6in metal. Every room in the house has an air return except for the kitchen and bathroom. Every room has a register, family room has 2 and living room has 3. The air seems to be fairly cold coming out of the registers and fairly strong on the short runs. All my dampers are open but I can't seem to get the house below 78 during the day and the system never turns off. It's a 1400 sq ft split level home with a fairly open floor plan in Ohio and the temps have been pushing 90. The contractor didn't do a manual J, which I just learned about. I had them come out and check the system and the tech said the unit was charged and the air temps were very good coming out of the furnace. He told me going to a bigger condenser wouldn't get the air any cooler and was worried about my blower. I've never had any problems heating the home on the coldest days. My neighboor has the same exact floor plan with a 2.5 ton unit and new furnace and could cool his home to 76 with the system turning off and on. Sorry I don't know what units he has. They are coming back out tomorrow and i'm guessing they are going to say it's the furnace blower not being strong enough. So my question would be does this sound right. I know it's a cheap system and all but would a new furnace make the difference and/or would a bigger condenser help? Sorry for my ignorance just thought I should be informed by people that seem to know what they are doing. Thank you for help.