Q. I'm living in Shenzhen, People's Republic of China. I live on the 9th floor of our 34 floor apartment building, and just had to have our external air conditioning serviced. I was alarmed and amazed as our air conditioning technician tied a rope around himself, and then went out the window to the external air conditioning unit to give it a dose of freon (as I held the rope!). My gf asked, what do they do in the USA?

A. In the USA buildings have central Air-Conditioning and the equipment is usually located on the roof of the building.

Q. Please anyone know the estimate? I have no idea and interested in getting central air conditioning system for my home...tks!

A. Trane and Carrier=You pay for advertising. I just bought a 3 ton Goodman for $1200 installed, outside unit only. Entire central air system with inside ducts, etc.: who knows.

Q. The air conditioning in our house went out over night & last time it happened (about a month ago) we changed the filter & it worked again just fine. So, we changed the air filter agian, but this time no luck. it's not sucking in air where the filters go, any suggustions -- besides calling someone over to repair?

A. Either your fan/blower isn't working, or for some reason it isn't trying to run. Check breakers, and fuses. thermostat setting.

Q. Should there be a small amount of water coming from the base of the unit inside the house? I can't figure out if it's the air conditioning unit or a leaking water heater?

A. No there should not...most likely the drain is stopped up and will need cleaning...this very easy and you can do it yourself ....just remove front cover of unit drain line should be visible along with two copper a/c lines...remove drain line ..flush with water hose ...run some bleach down it and reassemble....this should solve your problem...

Q. I have an outside central air conditioning unit, it is approx. 80 degrees outside and extremely humid, also very hot inside the house with fans running. The air is set to 70*, yet the air coming out of the vents feels to be room temperature and is NOT cooling the house down. Approx. two months ago, the landlord had a technician come out, and he said we had a slow freon leak, and although he filled it with freon, I was told he did not fix the leak. What is causing the air conditioner to do this? I cannot go in 100* weather without air conditioning. Any help would be appreciated :) and thanks in advance!

A. It almost sounds like the tech overcharged the unit. Either way he is supposed to fix the leak. He was not supposed to add refrigerant to a system known to be leaking. Make sure the fan is working on the outside unit. If it is not the system has no way to remove the heat from your house. Ask your landlord to call a different tech out to look at it. This guy was a fool.

Q. We desperately need an exhaust fan installed in our upstairs bathroom. There is one tiny window, which is not enough to expel all of the moisture (esp. living in FL!)... and no air conditioning vent. The bathroom is located on an exterior wall so I wouldn't think it would be too complicated. I just don't know who I should call to do it.

A. Actually, either one can do this job. When building new houses the electrician sets the fan housing and runs the wires, then the AC man runs the duct work when he roughs in his AC unit. Since there's gonna be a switch involved, I'd call an electrician first.

Q. The filter is completely frozen over with ice we cant even remove it.

A. Shut the AC off and let it defrost. Thats usually caused because the filter clogged from not being changed or cleaned. When the filter clogs, air can't circulate and the coils freeze up.

Q. What is the capacity of air conditioning unit to be use when you install at specific area and equipment loads availabilities?

A. You need more info here. The answer to this question is "install one with a capacity sufficient to control the load." To determine the capacity, add up the loads, multiply by the diversity factor, and you're done.