Cold House (Forced air system)

Timco

Louvers on the fan could be full of dust/dog hair if it was ran for a period of time with no filter. I found a plastic home depot bag in my rental unit's furnace after we closed and I got my hands on it! I like the prev idea of the fan limit control settings for low heat.

T

Dan Brennan

cold house (forced air system)

I own a Bi-level home(about 1800 sq. ft.) with forced air heating, also the central air unit is hooked into the furnace( so its hot in the summer also). I have vents that don't blow air or they blow very very low and even some blow cold air. Does anyone have any input on this, or a point in the right direction would be greatly appreciated.
Thanks

william_5

little heat

lets go through the simple things first when was the air filterchanged or cleaned? have you shecked your duck work any leeks? some duck work have throttle levers in them is the system balenced did you change your room supply registers? with return register plates?what settings are on your fan limit? forced hot air is dry what is the humidity in the house? have you used a secend thermastat to check the one on the wall?is the return vent or vents blocked?

Dale

cold air

The other post mentioned several good things to check, the main one in my opinion being the filter. If you have AC the inlet to the coil could be very dirty. But, a closed damper will also stop flow. The manual gas valve on your furnace could be partially closed. I guess we need more specific info. How new is your furnace? If a belt drive the belt could be broken or very loose or the motor could be running backwards. You can learn alot with a thermometer to check heat rise, the difference between supply and return temp will tell you alot about air flow. A new furncac will have this on the nameplate, an old one may have "bonnet temp" If you are moving enough air the supply temp will be about 130 for an old furnace and maybe 110 for a new condensening model. The idea is if the spread is too high you have poor air flow. Good luck