Latest Discussions : HVAC

monalisa

02:15AM | 12/13/03
Member Since: 08/31/03
9 lifetime posts
hey there,

I have a 3 and 1/2 ton furnace, which should be more than enough to heat my house, but it does not. The air that is coming out of the vents, (which are in the ceiling, if that matters any) is "lukewarm." When it is a freezing temperature outside the house does not even warm up to a comfortable level. Any help would be appreciated.

ML

VGone

04:02AM | 12/13/03
Member Since: 02/04/03
13 lifetime posts
All 90%+ efficient furnaces have "lukewarm" airflow coming out. Another reason is velocity of warm air from supply registers that is making you feel it is less warm. How about return registers grill? Make sure they are at bottom (top ones should be closed for heating season) and open without any obstacle. Think about weatherstriping your front door and windows if you feel cold air is rushing in house from some tiny hidden spots. As relative humidity drops in the house, it will make you "feel" more colder. Warm air supply registers should be at bottom and not at top. Anyway, I am little hasitant to blame the furnace but it could be the main reason also.
-vc


cellarwater

11:58AM | 12/14/03
Member Since: 12/09/03
175 lifetime posts
Is the ductwork insulated? if not do so also check the funace flter,it might be clogged hardware stores will carry new ones. Beyond that call a technician. C.

monalisa

01:05AM | 12/15/03
Member Since: 08/31/03
9 lifetime posts
Hi,

First of all thank you for your help.
My return register grills are at the top instead of the bottom, is that going to hurt me? Also, does the furnace it self have a filter? Where?

ML

plumber Tom

02:33PM | 12/15/03
Member Since: 05/10/03
801 lifetime posts
Ok let's try to clear this up. You must know how to identify a supply and return. The supply registers are the ones that feed the warm air into the room. You 1st stated that they were in the ceiling. Why? crawlspace underneath? slab floor? This may explain why they are in the ceiling. A return takes fresh air(larger registers usually mounted in the floor) back to the furnace. Your filter is located on what we call in the trade, the return boot. It's a large piece of ductwork shaped like a 90 degree bend. If your furnace is not set up this way where it simply slides in and out of the return boot, then it's inside the blower compartment. Frequent filter changes are needed in the heating season (once a month) to keep the blower motor and all electrical parts clean. I agree with cellarwater. If your supply ductwork is on the inside of un-insulated exterior wall, then this may explain the lack of hot air. Post back with more info and we can try to solve your problem. Tom

monalisa

03:28AM | 12/16/03
Member Since: 08/31/03
9 lifetime posts
hi,
thank you for trying to help me.
The return vent openings are located at the top (wall). The supply vents are in the ceiling. I had them installed just resently because the duct work under my house kept getting wet. The ductwork in the attic is insulated, the attic itself is not. When you said "if supply ductwork is on the inside of un-insulated exterior wall" what exactly did you mean? I really thank you for trying to help me.

ML

cellarwater

02:18PM | 12/16/03
Member Since: 12/09/03
175 lifetime posts
How far apart are the supply and return registers? also are they at ceiling level with the return ducts? If so, pipe the supply duct registers to near floor level.C.

monalisa

10:45AM | 12/18/03
Member Since: 08/31/03
9 lifetime posts
hi,

I am totally lost! Can you explain it so I can understand it a little better?

ML

cellarwater

01:18PM | 12/18/03
Member Since: 12/09/03
175 lifetime posts
Monalisa,I wish I knew where you're lost. remember this; heat rises. If the supply registers [hot air out] are at ceiling level the warm air wil hover up there if the return registers are also at ceiling level they'll take in that warm air. the result is poor circulation of air. A ceiling fan[s] may help that situation out though.

monalisa

01:17AM | 12/19/03
Member Since: 08/31/03
9 lifetime posts
hey,
got ya. I understand what you are saying now. Well yes, both are at the top, the return as well as the supply. I am cutting my ceiling fans on now to see if that will help me some. Thank you for that idea. One more thing I want to ask; will a "outside unit" hooked up to the furnace that I have now help any? Someone told me that this will give me more heating power, as well as a lower heating bill. Thanks again.

ML

cellarwater

01:08PM | 12/19/03
Member Since: 12/09/03
175 lifetime posts
Monalisa, Were getting to be electronic pen pals! I hope the ceiling fans help. I read through all the threads. Do consider insulating the attic when the weather gets warmer, also I hope that the furnace filters were changed. Outside unit? Plumber Tom my buddy I hope you can answer this one. C.

monalisa

01:35PM | 12/19/03
Member Since: 08/31/03
9 lifetime posts
Hey there

you are right, we are electronic pen pals. I thank you so much for helping me.
The outside unit, I guess is the heat pump that hooks up to the furnace. Again I thank you for all the help, just in case you are not able to write back.

ML



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