News & FAQ

Common Central Air Conditioning Questions | HVAC FAQ


Valerie Johannsen People & Brand Manager

In order to help you understand how your central air conditioning system works and shed some light on some common HVAC problems, we’ve compiled the top questions that homeowners ask about their central HVAC system.

Heating & Cooling Frequently Asked Question – FAQs

Q. What does it mean if my evaporator coil starts freezing up?

Although there are several reasons why your A/C evaporator coil might freeze up, the most common causes are: dirty filter, dirty evaporator coil, low refrigerant, and closed off supply vents/registers. If you schedule annual HVAC maintenance, these problems can be avoided. For cleanings and repairs, call Service Legends at 515-COMFORT (515-289-3872) to schedule an appointment.

Q. How long is my central heating and cooling system expected to last?

According to, the average lifespan of your central HVAC system is between 15 and 20 years. This assumes, however, that you support your equipment with regularly scheduled maintenance. We’ve found that systems without regular maintenance last between 8 and 10 years, while systems with proper maintenance last between 20 and 25 years.

This also assumes that your heating and cooling equipment has been installed properly. Besides regular maintenance, proper installation is the most important factor when estimating your system’s “lifespan.” According to, over half of all new HVAC systems do not live up to rated efficiency levels. This not only negatively affects your utility bill but also reduces the lifespan of your unit. “In fact, improper installation can reduce performance by as much as 30%.

Q. When should I replace my heating and cooling system?

There are many factors to consider when deciding whether you should repair or replace your current HVAC system: price, comfort, safety, warranty, previous repairs, repair cost, age of system, and guarantees.

Q. Does it make good financial sense to replace your system?

Since every home is different, determining whether you need a replacement requires a consultation and diagnosis from a professional technician. Replacing your heating, ventilation, and air conditioning equipment helps homeowners increase comfort, lower utility bills, and increase the lifespan of your system, but only if it has been installed properly. Use ENERGY STAR’s Bid Comparison Checklist to help find the right contractor for the job.

Your Service Legends Specialist will thoroughly assess your home and comfort requirements to determine the proper size and make the appropriate recommendation.

Q. Do I need to have my HVAC system serviced every year?

No, you don’t have to, but it’s definitely a good idea – it will ensure that your manufacturer’s warranties remain in effect, lower utility bills, increase comfort, improve indoor air quality, and ensure a longer lifespan. At Service Legends over 85% of our service calls could have been prevented with proper maintenance.

Signs Your Air Conditioner Needs to be Replaced

Heating and Cooling Des Moines Since 1997

At Service Legends, we take pride in heating and cooling Des Moines and the surrounding areas. Our HVAC services include furnace and air conditioner installation, repairs, maintenance, and tune-ups. Our lineup of Indoor Air Quality solutions includes whole-home humidifiers, air purifiers, and air filtration systems. We can even help with HVAC financing.

Call 515-657-6634 to contact our Home Comfort Heroes today. We’re standing by 24/7.

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