Hello, I have been reading on here for a week or so and my head is spinning. I was trying to educate myself a bit so I could ask the right questions to the companies giving me bids for a new dual unit. Decided to post a thread and hoped someone could turn me in the right direction. I have a 20 year old 5 ton 'Day n Night' dual unit (which I assume means the AC and furnace are in the same unit) that sits outside at the end of the house. The AC compressor went out last September but the furnace worked all winter. I decided to replace the complete unit (right or wrong?) because of its age.
I've had 3 bids, all expensive, all from large respectable companies suggesting similar solutions: Change the 2-16" return ducts to 18" and an Amer Standard 'Triumph' 4YCY4 unit. Why I am puzzled now is that after reading on this site, none of the companies offered to do any load calculations. They just looked at my 2700 sq ft home, saw the old unit was a 5 ton unit and said I needed larger return ducts to balance the return air and the supply air. I'm not saying they are wrong but is this how a standard estimate is given?
Any advice is much appreciated.