I had a new oil furnace installed at the end of 2007. About a month into operation I realized there were signs of problems. I went back and forth with the company to figure out some issues. The furnace does perform as expected. I figured the replacement furnace was oversized for my duct work. Below is what I've come up with on my own.
The furnace is noisy, short cycling and unfomfortable high and low room temps. There was also some kind of backdraft that left an oil smell. This was corrected by leaving the basement door open to allow for more return air to the furnace. I even found a 12x14 cutout in the return trunk, (masked by floor joists) to allow for more return air. I have a feeling that the original furnace was even oversized, because of the hole I found in the return trunk. Now it's twice as bad.
My current furnace is a Hallmark 115d Highboy. The BTUHs are 140,000 input and 114,000 output. Below are my results using a HVAC Calc program I purchased. Interested in knowing what people think now that the heat loss/gain calcs are complete.
The first calculations for the house had a heat loss of 50,240-52,119 BTUH for the basement, first and second floors. The difference in BTUH range was, whether I zoned the rooms or not, the heat gain ranged from 14,069-14,926. I included the basement, because there were two registers cut into the supply trunk that maintain a basement temp. of 52 degrees. Otherwise, the individual heat losses are- basement 17,377, 1sr floor 21,189 and 2nd floor 11,674 BTUHs.
I also made calculations that only took the first floor and basement into consideration. These calculations were if the future HVAC pro wanted to consider using two furnaces. One furnace properly sized in the basement and a new one in the attic. The results were basement and 1st floor at 38,185 BTUH losss and the second floor only at 22,119 BTUH loss. A second reason for the two furnaces, was the fact that the duct work may need to be redesigned and one second floor bedroom is colder than the others. It even is situated on the southside.
Look forward to any comments. Thank you for reading.