Question 1

Why is my central AC running but not cooling the house?

Accepted Answer

There are several common causes for a system that runs but fails to cool. The most frequent are low refrigerant charge due to a leak, a dirty evaporator coil that can't absorb heat efficiently, a failed capacitor causing the compressor or condenser fan to underperform, or restricted airflow from a clogged air filter or blocked ductwork. A technician can measure refrigerant pressures, airflow, and electrical operation to identify which condition is present.

Question 2

Why does my air conditioner keep tripping the circuit breaker?

Accepted Answer

Repeated breaker trips are a sign that the AC system is drawing more current than the circuit is designed to handle. Common causes include a failing compressor drawing locked-rotor amperage, a weak start or run capacitor, a seized fan motor, or a short circuit in the wiring. This is a condition that should be diagnosed by a licensed technician promptly — repeatedly resetting a tripping breaker without identifying the cause can damage the compressor and create a fire hazard.

Question 3

Why is there ice forming on my air conditioner's refrigerant lines?

Accepted Answer

Ice formation on the refrigerant lines or evaporator coil is almost always caused by either restricted airflow or low refrigerant charge. When airflow is inadequate — due to a dirty filter, a failed blower motor, or blocked registers — the evaporator coil gets too cold and moisture freezes on its surface. Low refrigerant produces a similar effect by causing abnormally low coil temperatures. If you notice icing, turn the system off or switch it to fan-only mode and call for a diagnostic visit, as running a system with a frozen coil can damage the compressor.

Question 4

How long should a central air conditioning repair take?

Accepted Answer

Most single-component repairs — replacing a capacitor, contactor, fan motor, or clearing a clogged drain — can be completed in one visit typically lasting one to three hours. Refrigerant leak repairs can take longer depending on the location of the leak, and may require a return visit if parts need to be ordered. Our technicians arrive with commonly needed components stocked on the service vehicle to complete straightforward repairs same-day whenever possible.

Question 5

My AC system uses R-22 refrigerant. Can it still be repaired?

Accepted Answer

Yes, R-22 systems can still be repaired. While R-22 refrigerant is no longer manufactured in the United States under EPA regulations, reclaimed and recycled R-22 is legally available. However, the limited supply means that recharging an R-22 system — particularly one with a significant leak — can be costly. Tandem Mechanical will present you with an honest comparison of repair cost versus system replacement so you can make the most economically sound decision for your situation.

Question 6

What is short-cycling and why is it a problem?

Accepted Answer

Short-cycling refers to a condition where the air conditioner turns on, runs briefly, shuts off, and then repeats the cycle rapidly — never completing a proper cooling cycle. It can be caused by an oversized system, low refrigerant charge, a dirty air filter, a refrigerant line obstruction, or a faulty thermostat or control board. Short-cycling is hard on the compressor because startup is the most mechanically stressful part of the operating cycle, and a system that short-cycles excessively will wear out much faster than one that completes normal run cycles.

Question 7

Should I repair my old AC or replace it?

Accepted Answer

The answer depends on the age of the system, the nature of the failure, and the cost of repair relative to replacement. A simple electrical component failure on a 7-year-old system almost always makes sense to repair. A compressor failure or major refrigerant leak on a 14-year-old R-22 system often tips the scales toward replacement, especially when you factor in the efficiency improvements of modern equipment. Tandem Mechanical will give you a straightforward assessment of both options so you can make an informed decision without sales pressure.

Question 8

How often should central AC be serviced even when it seems to be working fine?

Accepted Answer

Annual preventive maintenance — ideally in the spring before the cooling season begins — is the standard recommendation from equipment manufacturers and HVAC industry organizations. During a maintenance visit, a technician checks capacitor health, measures refrigerant pressures, inspects electrical connections for corrosion or looseness, cleans the coils if needed, and flushes the condensate drain. Catching a capacitor that is failing but hasn't failed yet, or a refrigerant charge that is slightly low, is far less disruptive and costly than a full system shutdown in July.

AC Repair in Bernardston, MA

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