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Maybe they are carrying a few pounds of R22.

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If you are feeling cold air, and no heat is felt coming out of the duct, then the room has become depressurized and outside (cold) air is being pulled in from around windows, or other areas.
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I had a situation similar to yours. Air was flowing rapidly under the door to the basement.

I determined that I had a rather large leak in my return system. I made a simple tool using a dowel...

I would go ahead and schedule the maintenance. It could be a relatively inexpensive fix.

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My rate in southern New Jersey has been running $1.45 - $1.50 per therm. That's with All charges included.

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I don't think that's a matter of sensitivity. If you are getting a call for cooling, which is interrupted (turns off), then back on in 10 seconds, something is wrong.

A decent thermostat, and...

Turn your thermostat up 5 degrees or so. It should kick in auxiliary heat.

Perhaps, at night when it gets cold, the balance point may be set too low, or the HP is not super-efficient and is not...

On the opposite side of the wall (possibly in a closet), there should be a removable panel. Inside, there should be shut-off valves for hot and cold water. If not there, then maybe in basement.
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By all means, use a pump.

I just had my system replaced with a 95% furnace and a/c. The condensate is pumped up about 15 feet and discharged into a first floor laundry tub. (my design)

Now I...

I had a new Hi Eff furnace/air conditioner installed.

During the slack period (no heat/cool) I noticed a slimey feel inside my pump. Ran some dilute clorox through it (several cycles) and slime...

Stating heating and cooling degree days does not give a true value for sizing heating/cooling, since your dealing with averages of temperatures in a period.

Did your 'manual J' state heat loss and...