Air conditioning and HVAC units don’t last forever — 12 years is
an average lifespan — and the moment they fail is 
usually when you need them the most. The good news is that not every system malfunction spells total doom. Many nuisances are so cheap and easy to fix, you’ll kick yourself for not doing them sooner.
Warning sign #1: My air conditioning won’t turn on
Possible cause: Often, the most likely culprit is the easiest to remedy: the thermostat isn’t set correctly or power isn’t reaching the AC unit.
The fix: Check to see that the thermostat is set to AC or “cool,” that the temperature setting is correct and that the battery is fresh. Second, check the circuit breaker.
Warning sign #2: I’m not as comfortable as I was last year
Possible cause: If you aren’t comfortable, the problem usually can be traced to issues with airflow.
The fix: Change the filter. (You should do this as part of regular HVAC maintenance anyway.) Depending on the quality of the filter, the amount of people living in the house and if there are pets, the filter should be changed every 30-90 days.
Outdoors, make sure there’s at least 24 inches of clearance on the sides and 5 feet on top of the unit. Check to make sure there are no obstructions to the home’s cold air returns and registers.
Warning sign #3: My utility bills are abnormally high
Possible cause: A spike in operating costs typically signals inefficient operation. After a dirty filter, the most likely culprit is a choked condensing coil. Located within the outdoor unit, the coil has countless cooling fins — much like a car radiator — that can accumulate dust and debris.
The fix: Call out a pro for a spring tune-up.
Warning sign #4: Weird noises during startup and operation
Possible cause: Rattling, buzzing or ticking? The good news is that the cause might be little more than a loose screw. The bad news is that it could be caused by a bum blower motor (indoors) or bent fan blade (outdoors).
The fix: If you’re lucky, a simple tightening here and lubricating there will fix the problem. If not, you might require a new fan motor or fan blade.
Warning sign #5: The AC shuts off before or long after I’m comfortable
Possible cause: Improper placement of the thermostat can wreak havoc on one’s comfort. The unit might be in direct sun, too close to a register or near a hot oven. Also, a remodel might have you spending more time where the thermostat is not.
The fix: Relocate the thermostat.
Warning sign #6: There’s a puddle of water next to my furnace
Possible cause: During normal operation, the system generates moisture in the form of condensate. That water collects in a pan and flows out a line either into a floor drain or sump basin. An
accumulation of water signals a blockage or disconnection of the tube.
The fix: Inspect the tube for crimps, clogs and disconnections. Also, if the water flows into a sump basin, ensure that the sump pump is in good working order.
Warning sign #7: The air coming out of the registers doesn’t feel as cold as it used to
Possible cause: The refrigerant lines aren’t insulated.
The fix: The outdoor unit is connected to the indoor system by two copper refrigerant lines, which should be covered with an insulating sleeve. Make sure that it is. Also, the system may need its refrigerant re-charged.
Warning sign #8: My AC unit refuses to kick on at all
Possible cause: Burnt-out compressor.
The fix: If the compressor fails, the unit won’t run. The only fix for this is a costly replacement of the equipment.
Read more: http://www.houselogic.com.http://www.houselogic.com/home-advice/heating-cooling/no-sweat-programmable-thermostats-save-energy-costs/ – ixzz1dyqVq2mt
Tags: Air Conditioning
