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.

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Q. I have an air conditioning unit in the wall of my living room that has been permanently installed. What is the best way to clean it and the reusable filter? I just want to get the dust and crud out so it runs better.

A. Your best bet is to do an internet search based on the manufacturer and model of your AC unit. You may be able to find a user's manual that will tell you how to take apart the unit to clean it.

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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.

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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...

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Q. The recent problem seems to be related to the outdoor cooling fan. The air conditioning system seems to be working properly, but there is a loss of cooling of the air coming from the indoor air conditioning vents. I inspected the outside unit, and yesterday the cooling fan was stopped with a humming/grinding sound. The capacitor looked good (no bulging), but I'm not an electrician and I have no way (or the knowledge) to test voltages and amperages and such. Anyway, I blew on some dust/dirt/cobwebs around some of the wires, and started the system back on and the fan moved at normal speed and the system worked and cooler air came out. However, today, the indoor temperature wasn't maintained and I went outside and the cooling fan was running much slower (but it was running). After I turned off the system, I felt the metal cover of the outside unit, and it was very hot, and it seemed that the source of the heat came from directly above the cooling fan motor. Please contact me!

A. Replace your outdoor fan and while your at it replace the capacitor and everything will be fine. But turn your unit off untill you get it fixed or you'll be changing a compressor or buying a new unit.

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Q. I live in an upstairs condo. I have a small window air conditioning unit. I was going to install it on a shelf outside the window, but my guys said it is fine sitting on the window ledge backed up to the screen of the window and lowering the window down on top of it, as it has exhaust and intake. Any air conditioning experts out there who could tell me if this is a less efficient way for it to run, or is it all right?

A. Unless things have changed, the screen is approx. 3 to 4 inches from window sash ( the glass) the unit is about 14-16 inches deep. they r designed to sit flush to the sash with the upper arm( brace) touching the bottom of the sash u raised to put the unit in.and the slides on the side of the unit slide over to cover the gaps. i think u would be wise to read the instructions and follow them.

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Q. In a 2400 sq. ft. house?

A. On the average $30.00 per vent plus a $40 set up fee per system price is usaully dictated by the numbers of vents in your house not the sqft

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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.

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