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Here’s a problem you likely never anticipated: Ice on your HVAC in the middle of summer. It’s actually more common than you think!

When we’re running our AC units more often and at colder temperatures, they’re more likely to freeze up. If you notice something wrong with your AC, especially visible ice crystals, it’s time to take action. We’re here to help you defrost and get back to normal cooling ASAP.

How Will I Know If My AC Is Frozen?

Other than visible ice on any part of your HVAC unit, the next most obvious sign of a frozen AC unit is a lack of cool air. If you put your hand in front of your supply vents and you sense warm air coming out, you probably have ice somewhere in the system. 

You may also notice a hissing sound coming from the unit. If that’s the case, take steps immediately to prevent further damage. Your wallet will thank you later.

How to Defrost a Frozen AC Unit?

Your AC will take anywhere from an hour to more than a day to completely defrost. It’s important to catch it early to prevent further damage to your unit – and, of course, so you’re without cool air for the shortest amount of time possible. Here’s your step-by-step defrosting guide:

Step 1: Turn OFF Your AC

We know, we know: It’s hot.  But frozen AC parts are bad news for the most expensive piece of your HVAC unit—the compressor. To avoid lasting damage and a hefty bill, turn your thermostat from COOL to OFF. This will start the defrosting process.

Step 2: Switch the Fan to ON

Turning the HVAC fan to ON will force it to blow warm air over any frozen coils – which will speed up the defrost process. Make sure it’s actually set to ON and not to AUTO. Automatic settings cause the fan to cycle – starting and stopping over and over again. You want continuous, non-stop airflow over the frozen areas. 

Step 3: Find the Source

Now it’s time for some investigative work. What caused your AC to freeze up in the first place? There are a few common culprits:

  • Dirty Air Filter

Clogged-up air filters essentially suffocate your HVAC unit. When warm air is restricted from the coils in your unit, the coils get too cold and eventually ice over. Replace air filters at least once a month to prevent an icy surprise.


  • Dirty Evaporator Coils

If your coils are dirty, the same process occurs. Dirt and grime covering the evaporator coils causes air restriction the same way dust does in your filter.

  • Leaking Refrigerant

If you spot a leak anywhere, that’s probably the cause of your ice problem. Low refrigerant levels cause drops in pressure, allowing moisture in the air to freeze around your HVAC coils. 

Despite what many homeowners may think, refrigerant doesn’t simply get “used up.” It doesn’t decrease over time, and it doesn’t evaporate during AC use. So if you’re low on refrigerant, there’s no doubt you have a leak. 

Note: Refrigerant is a hazardous chemical that should only be handled by licensed pros. Give us a call if you think you have a leak!

  • Problem Parts And Other Issues

A collapsed duct, weak blower, or closed valves might be causing your HVAC to freeze. AC units are also complex machines with a lot of other pieces and parts. Our Calgary HVAC pros can help to diagnose these less obvious problems.

Step 4: Monitor the Situation

As your HVAC unit thaws out, you might encounter some collateral damage. Overflowing drain pans and clogged condensation drains are a risk when this much water is coming off your AC. Put down some towels around the unit and watch for additional leaks to prevent water damage. 

Once your HVAC is completely clear of ice and all parts are dry, you can turn your AC back on. Monitor the unit for continued problems over the next several hours to a few days.

Step 5: Call Us

If changing the air filter solved your ice problem, you’re in luck! Now it’s time to keep your unit in top shape throughout the summer. Getting regular preventative maintenance and inspections can help catch issues early and prevent your AC (and your wallet) from freezing up.

Unfortunately replacing the air filter is the only thing you can do yourself. So if that didn’t work, it’s time to call us. All other issues are best diagnosed and treated by our team of Calgary HVAC professionals.

We’re happy to help!

Serving Calgary, AB and surrounding areas

We take immense pride in providing Calgary, AB and surrounding areas with top-notch plumbing, heating, and cooling services, ensuring every home and business operates smoothly year-round. Our team’s expertise and dedication shine through in every project, earning the trust and satisfaction of our valued customers across the city. Serving you isn’t just a job for us; it’s a commitment to excellence and a testament to our passion for keeping our community comfortable and thriving.

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A job well done.

Barry did a great job in replacing a leaking Hot Water tank. Just a bit shocked at how much the cost of a new tank has increased over the years. We would certainly use ClearView for future jobs.

Ken Stowell

Arrived on time and did a quick and efficient replacement of my kitchen sink faucet. Also took the time to further explain the operation of the water softener installed on the last visit.
Richard was friendly and knowledgeable. Great service!

Marybeth Marrow

Had them update and install our infloor heating two zones, and add tank less hot water on demand and install a water softener. Our technician was very professional kept his work area tidy, cleaned up after himself. He also wiped down all the equipment used including piping and tubing. He was friendly, kept us informed on his progress. You could tell he enjoys what he does… great job Thank you so much.

Carol Hill

Heinz was professional and honest. He gave me options and the price. The price was the price and there were no extra charges. He worked on a boiler system that was having issues. He flushed and cleaned system and everything is back up and running. When he was finished he asked if I had any question. I look forward to him coming back to service this system again.

Curtis W.

The appointment to come to check my boiler was prompt and early I’m the day so I didn’t have to wait the whole day. I received a call 15mins before the arrival. An email and a text was sent earlier. Gerry introduced himself and told me his purpose. He checked my boiler for a while then explained clear to me what the problem was, it was relief to know that it is nit necessarily a serious one. He made further checks and made some recommendations for change of some worn out parts, the re-glycol – 10yrs overdue and some leak that…

Roland B.

Jon was on time and dispatch team did their best to get him to the property to do an inspection on leaking pipes and backup sewer system. Jon then immediately got another job into the system to have a deeper inspection of the entire system to determine where the blockage was.

David Crawford

Can’t say enough about the great service I received from Heinz regarding some concerning alerts we got on our Ecobee Smart Thermostat yesterday. I felt cared for and trusted that he was focused on the necessary followup to assure our safety. Heinz is very good at his job.

Kim Koch

Drake Ahern did an awesome job cleaning the ducts. Was very friendly and professional. Worked hard and paid attention to all the details. I’d definitely have him back next time.

David Dickinson

Clearview was excellent to deal with. Very professional in their approach and the picture sent of the plumber before hand is an excellent idea. Richard was great to deal with. He gave me different options to resolve the problem.

Rick Pultz

John came out to review our heating and AC set-up. He was very knowledgeable and patient as he walked us through the various units and proposed maintenance program. Would highly recommend.

Lucus Tomei

We could not do the water valve replacement because the city could not shut the water off. I was warned ahead of time that this might happen so was not worried. Yamil was courteous and professional and I look forward to his return when the city can fulfill there end of the job. Justin and Sean were great with the furnace install. It went smoothly and Justin explained the new thermostat fully. The walk through on the furnace was useful and timely. Justin and Sean were friendly and professional and great to work with. John who came out for the initial inspection…

Paul Palardy

I had furnace venting replaced. This company is efficient and very professional. You know who is coming to do the work and given notice of when they’ll arrive. Heinz was very knowledgeable, professional, was not bothered by all my questions. He gave full explanations, reasons why, and great advice on maintenance care. He showed that he cared about what he was doing and was very efficient in getting the work done quickly. I highly recommend this company and Heinz.

Elsa Krienke

Our hot water tank blew and fortunately we noticed right away. We called Clearview Services late in the evening and we were answered right away. We were kept in the loop throughout the entire experience and Gabe Colpitts was the service technician who visited the next morning. He was very professional and spent the time to explain and educate the different options that were available. We were up and running with hot water the very next day.

Mike Mario

Thank you! Your service has always been reliable, professional,and friendly.
Rural folks can depend on you, as We have for more than 30 years, for both our property and others.
If you say you’re coming – you show up- or you promptly let us know of any delays! AND do a fantastic job. We’d asked for certain day & hours, as our neighbour has a B&B, didn’t want to cause issues with septic removal smells for them. YOU DELIVERED! Thank you. The Jackson’s.

Robert Jackson

Barry was fantastic. Explained the steps that would be required to detect the leak and then proceeded with the work. He was professional and managed to fix our issue same day. He left our home clean and tidy before leaving. Overall very happy.

Jonathan Wilson

I felt the company is oriented on quality of customer service , they send me the track link when dispatch the plumber, and the plumber is super on time too . I really appreciate Richard , he is supper patient to help me find out what is the best solution, focus on customer’s interest . Thank you again , I will definitely use your service again when I having plumbing problems, which I hope it will never happen.

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