Was doing an energy audit today because the client was concerned about one room in the house being consistantly colder than all the other rooms. I had my weather gauge with me so I decided to see if there was a restriction in the ducting by measuring the cubic feet per minute and temperature at the registers in the home. When I got to the family room, I almost burned my hand when I put the meter over the vent. It read 590 cfm and was pumping out 166 degree air. This vent is close to the heating system in the basement and is likely the first in line off the main trunk. There were signs at the heating system that there might be a cracked heat exchanger, but I do not have the equipment to do a combustion analysis to determine that for sure. The rest of the house was measuring approximately 300-350 cfm at about 120-130 degrees.
I am thinking that these temps are pretty high and could be an issue. There was also ducting running through the walls and the wall surfaces measured 97 degrees. Anyone have an idea what would make a heating system pump out air at such a high temperature?
It was a Carrier forced air system that is nautral gas fired. System is rated at 125000 btu/hr.