When air conditioning systems stop working the repairs can be expensive. In the average home, the ac system is the most complex component. Very few homeowners have the technical knowledge to determine the problem and initiate repairs. This leaves them at the mercy of the ac repair services. Across the country, and even in Silver Spring, MD, there are technicians that view the homeowners' lack of knowledge as an excuse to overcharge for repairs.

Knowing how to recognize when a technician is lying about a needed repair or charging too much for a simple repair is the best defense against scams. By exhibiting some basic understanding of AC units a homeowner can discourage abusive actions. The explanations here will help the consumer appear more aware of system problems and repairs. Few technicians will try to take advantage of someone who knows something about air conditioning units.

All air conditioning systems are complex multi-technology systems consisting of refrigeration, electrical and electronic subsystems. Breakdowns can happen in any of these subsystems. It is common for technicians to claim that a failure in one component caused damage to other system components and the entire unit must be replaced. The only thing that will cause multiple system failure is a lightning strike. Lightning will leave visible indications. All the subsystems are repairable and complete replacement is rarely required. There are a few repairs that can be expensive enough to make replacing an AC unit attractive.

Competition among the many AC unit manufacturers to keep prices down leads them to use the least expensive components. A surprising number of basic components are identical between different brands. Local suppliers have generic replacement parts that will work in almost all brands and at prices much lower than OEM prices. Some repair services will charge much higher OEM prices for locally bought generic parts.

Refrigeration is the heart of air conditioning. The term "FREON" is actually a brand name for the refrigerant gas that makes AC units work. This gas is not consumed as the system operates and should not require replacement unless a leak occurs. If a technician has to "top off" the refrigerant charge, either he is lying or there is a leak. A properly sealed system should operate for over five years without loosing substantial refrigerant. A system can operate with small losses of refrigerant with no problem. If refrigerant loss has caused a system to stop working there is a leak.

Many leaks can be repaired without complete replacement. Leaks in the evaporator or condenser coils may require replacing the coil. This can be expensive enough to justify considering replacement. Leaks in tubes are repairable and most mechanical components such as valves, can be replaced. Refrigerant is marginally expensive but most residential units require less than ten pounds at much less than $15 per pound

The most complex and expensive single component in an air conditioner is the compressor. Compressors are replaceable. Replacement compressors are generally available locally and a competent technician should have no problem performing the replacement. If a service company pressures the consumer to replace the entire unit, a second opinion is recommended before spending a few thousand dollars. In Silver Spring, MD most ac repair services are honest. A homeowner should listen to his inner voice and do some background checks if he feels he is being scammed.