A: Our AC clean & check is $98.95 for the first system. If you have a second system, the additional unit is $93.95 -- so two systems are $192.90. This includes a full performance evaluation of your air conditioning equipment. Preferred Partner Plan members receive HVAC system checks (twice annually, both cooling and heating) at no additional charge as part of their membership starting at $19/month. Call 314-819-0028 or visit our AC Systems Check page to schedule.

A: A cooling system check ($98.95) is a routine maintenance visit for a system that is running normally -- we inspect, clean, and verify everything is operating correctly. A diagnostic service call ($99) is what we perform when your system has a problem -- it is not cooling, making a noise, or has stopped working. We need to diagnose the issue before we can repair it. If you call for a routine system check, but your system is already malfunctioning, a diagnostic fee applies so we can properly assess and fix the problem. If you are unsure which you need, call us, and we will help you: 314-819-0028.

A: The Preferred Partner Plan starts at $19/month for one system, which equals $228 per year. If you choose monthly auto-pay, your 12th month is free -- bringing your effective annual cost to $209. For homes with two HVAC systems, the annual rate is $410.40 with multi-system discounts applied. The plan is a 12-month contract with monthly or annual payment options. Call 314-819-0028 or visit our Preferred Partner Plan page to enroll.

A: Preferred Partner Plan members receive 50% off diagnostic fees, 50% off after-hours diagnostics, 15% off repairs, and 5% off new equipment purchases. Combined with priority scheduling and two included HVAC system checks per year, the plan typically pays for itself with just one repair visit. Call 314-819-0028 for details.

A: Possibly, yes. Most HVAC manufacturers require documented annual maintenance to keep the warranty valid. If your system fails and you cannot show records of routine maintenance, the manufacturer may deny a warranty claim. The Preferred Partner Plan includes two system checks per year and documents each visit -- which protects your warranty coverage. This is especially important for newer systems still within the manufacturer warranty period. Call 314-819-0028 if you have questions about your specific equipment.

A: Turn off your air conditioning immediately and switch the thermostat fan setting to fan-only mode (not auto). This lets the ice melt without damaging the compressor. A frozen coil is usually caused by one of two things: a dirty air filter restricting airflow, or low refrigerant. Check and replace your filter first -- if the system still freezes after thawing and running again, call Air Comfort Service at 314-819-0028. Low refrigerant requires a technician and should not wait.

A: The most common causes are a dirty or clogged air filter, low refrigerant (which can also cause the coil to freeze), a dirty outdoor condenser unit blocked by debris, a tripped circuit breaker, or a failing compressor. Start by checking your filter and making sure the outdoor unit is clear of leaves and debris. If the system still is not cooling, call us at 314-819-0028 -- we offer same-day service throughout St. Louis and will diagnose the problem with upfront pricing before any repairs begin.

A: The HVAC industry has a $5,000 rule: multiply the cost of your repair by the age in years of your system. If the result is over $5,000, you may want to replace. However, the average HVAC system lasts 12-15 years, so if your system is on the younger side, that may change your thinking. Use our free tool to help make an informed repair or replacement decision: https://www.aircomfortservice.com/repairorreplace/ .

A: Air Comfort Service offers a free second opinion specifically on heat exchanger failures and compressor diagnoses -- two of the most expensive recommendations you can receive from an HVAC technician. If another company has told you your heat exchanger is cracked or your compressor has failed, we will send our own technician to verify that diagnosis at no charge. For replacement quotes, we also offer free in-home estimates. Call 314-819-0028 to learn more.

A: It can be. The most common cause is a clogged condensate drain line -- the tube that carries moisture collected by your AC out of the house. When it clogs, water backs up and can overflow the drain pan, potentially damaging ceilings, walls, and floors. In the short term, turn off your system to stop the overflow. Call Air Comfort Service at 314-819-0028 to schedule a service visit.