Originally Posted by ilyaz
I guess I'll put back the original MERV 10 filter and see if this improves things
So is it possible that the valve was set to the right pressure with the old furnace but was set improperly by the installers of the new one? I don't think I want to mess with trying to measure the pressure myself (unless it's really simple - is it?) but I'll definitely ask them to verify this if they do come to inspect the system.
What's the easiest way measure the temps? Where exactly should I stick the thermometer?
I was under the impression that the blower speed is set automatically by the system. Or can it be adjusted manually?
They might have fired it up the way it came from the factory. So it might not be right. The inducer is moving the proper amount of air through the heat exchanger for the btu. out put of the furnace, so if the gas pressure if off the furnace can be less eff.
If your booklet tells you how to clock the gas meter, and there is a chart in the book then you can check it that way.
measure the temps by checking the closes return by the furnace and then the the temp in a hot air register as close as you can get to the furnace.
Most furnaces have 4 speeds and you are only using two. You have to move some wires around to change the speeds. The should have checked the air temp across the furnace, and set the speeds right for heat and air.
I have checked gas pressure and when i clocked the meter, i found that it was out of calibration and a 60,000 btu furnace was using 90,000 Btu of gas, charged him 1/3 more for gas than what he was using. Later Paul