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Old 12-23-2012, 07:54 AM   #1
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Not enough heat blowing from the vents


It feels like I may have an issue because my heat pump will not turn off. It's blowing semi-warm air. Not sure if its hot enough. It's been on for the last 3 hours straight maintaining 69 degrees at the Tstat. I would think it would have shut off by now. It's about 42 out right now. What should the heat be at coming out of the vents? What else can I check?

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Old 12-23-2012, 09:32 AM   #2
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Not enough heat blowing from the vents


The heatpump should put out about 100F near the furnace (if you can measure). Depending on how far the vent is from the furance, and how well you house is insulated, and the out door temperate and wind, the temperate at the ven will be lower the farther it is from the furnace.

There are 2 copper pipes leading from the HP to the furnace/blower. The bigger one should be quite hot to the touch and wrapped in insulation. The smaller one is room temp and exposed.

Is the heat pump running (fan spinning)(outside) and defrosting every once in a while...big puff of steam.

Check your filters. Maybe they are not breathing well and need to be replaced.

good luck!
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Old 12-23-2012, 10:09 AM   #3
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Not enough heat blowing from the vents


Everything seems to be working for the moment now that its a little warmer outside..... It was about 32 in the early morning.

On a side note, I turned on emergency heat and noticed that only cold air blew. Is this because there are no heater elements in the AH? Normal?

Thanks for the great tips. I'll give them a try if there's a problem again. For now, I have other things to fix around the house!
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Old 12-23-2012, 10:27 AM   #4
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Not enough heat blowing from the vents


Where do you live?

How old is your unit?

Is the volume of air the same as its always been?
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Old 12-23-2012, 10:30 AM   #5
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Not enough heat blowing from the vents


Jacksonville FL.

16 years old.

Yes the volume of air is strong. It's a new blower motor.
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Old 12-23-2012, 01:42 PM   #6
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Not enough heat blowing from the vents


Thanks, its always good to give as much information as you can when making an inquiry. If you give the make and model number, some of the pros that come on here can point you in the right direction based on a particular models service history. My furnace, for instance, was involved in a class action lawsuit for premature failure of its secondary heat exchanger. Keeping from us the fact that someone just put in a new blower motor does not help us help you at all. If your blower worked right before they replaced it maybe its hooked up wrong.
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Last edited by jagans; 12-23-2012 at 01:45 PM.
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Old 12-23-2012, 06:04 PM   #7
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Not enough heat blowing from the vents


I replaced the blower motor myself with an oem one from Lennox. It's a wiring harness that was plugged into it. It would be pretty hard to screw that up.

I'm not completely sure if anything is wrong with it. I guess I won't know until the next freezing night.

When I looked out the window this morning I did see some very slight frost on the very left side of the top of the heat pump.

Here is the unit.
Burning smell from vents when ac turns on

Last edited by noone; 12-23-2012 at 06:11 PM.
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Old 12-23-2012, 07:30 PM   #8
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Not enough heat blowing from the vents


Apparently your aux heat isn't coming on.
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Old 12-23-2012, 08:06 PM   #9
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Not enough heat blowing from the vents


Would someone mind explaining the difference between aux heat and emergency heat?

If I set it to emergency heat, only cool air blows.

If I leave it on regular heat mode and turn the temp in the stat up to 80 (it's usually set at 69), the aux heat indicates and the air is very warm.

In normal heating mode, the air feels only slightly warm.

I don't recall seeing any sort of heating strips in the AH. Seems I recall there only being a condenser in there.
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Old 12-23-2012, 08:14 PM   #10
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Not enough heat blowing from the vents


Aux heat is when the heater it comes on while the heat pump is running. Emergency heat is when the thermostat only brings on the strip heat, not the heat pump. most thermostats require a a jumper from aux to emergency heat terminal for the emergency heat to work.

Your air handler has a strip heat package in it. Your stat is probably not wire up correctly.
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Old 12-23-2012, 08:19 PM   #11
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Not enough heat blowing from the vents


Got a pic of what strip heaters look like?

All heat pump air handlers have them?

I could have sworn there was only an a frame in there......

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