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R-22 is being gradually phased out and manufacturers are now prohibited from manufacturing new equipment with R-22 in it. R410a is the current "new" freon that most manufacturers are now using. As supplies of R-22 become more scarce, it's cost is sure to keep increasing. If your system has a slow leak and you have to keep having it "topped off" every year, it would be wise to consider replacement and convert your system to R410a.

Most systems will last 10-20 years if they are properly installed and adequately maintained. Most homeowners under-estimate the value and importance of having their systems cleaned and checked annually. This will shorten the useful life of the equipment and increase operating costs.

Probably not. Proper cooling is a function of many items including ductwork sizing, system run times, and proper humidity control. A larger unit may cool your home faster, but shorter run times will not permit proper dehumidification to occur. Sizing a system for a limited number of extremely hot days will adversely affect it's ability to perform properly when it is running the majority of the time. Wider temperature swings and lowered overall comfort will be observed when a system is improperly sized. Increased energy usage and higher utility costs are other reasons to not "oversize" a system.

It depends on the type of air filter your system has: 1" wide disposable air filters should be checked and/or replaced monthly. Media type air filters should be checked/replaced every 6 months. EAC (Electronic Air Cleaners) should be cleaned every 3 months.

Probably not. Federally mandated efficiency standards have forced manufacturers to increase the size of condensing units to lower their energy usage. The indoor coil (evaporator) must be properly sized for the outdoor unit it is connected to for proper cooling to occur. Some manufacturer's warranties may be voided by not replacing the indoor coil at the same time the condenser is replaced.