What is a split system air conditioning unit in Calgary

Start by checking the size of your space. A cooling setup that’s too small won’t keep up during heatwaves, especially with how warm July and August have been getting. Too large, though, and you’ll waste energy, see uneven cooling, and probably hear it cycle on and off more than you’d like. There’s a sweet spot–measured in BTUs per square foot–but local insulation, sun exposure, and ceiling height all shift the math. It’s not just about square footage. A two-storey post-war house in the northwest part of the city won’t behave the same as a newer bungalow in Auburn Bay.
If you’re adding one of these cooling solutions to an older property, be prepared for surprises. Some walls aren’t insulated well enough to hide refrigerant lines, and sometimes you need to upgrade electrical panels. We’ve seen it before–a straightforward install turns into two days of drywall repair and electrical coordination. Not a dealbreaker, just something to budget for. It’s worth asking if your panel can handle the extra load, especially if you’ve added a hot tub or EV charger in the past few years.
Maintenance-wise, there’s a bit more to think about than just cleaning a filter. Annual coil checks matter. So does making sure the outdoor condenser isn’t blocked by snow piles that stick around until mid-March. We’ve had customers forget about that part entirely–then call us wondering why their cooling barely works when they finally turn it on in May. Small stuff like that can sneak up on you.
Honestly, no setup is totally hands-off. But if you choose the right size, prep your space properly, and do a bit of seasonal upkeep, you’ll probably get a decade or more of reliable summer comfort. It’s not magic. Just matching the right gear to the right house–and making sure it’s not neglected the other ten months of the year.
How to Choose the Right Split System Size for Calgary’s Climate
Don’t guess based on square footage alone. It’s tempting to use a simple chart–like 20 BTUs per square foot–but that rarely gives you a number that actually works here. The difference between a 1,200 sq ft 1970s duplex in Forest Lawn and a newer build of the same size in Seton is significant. Age of the property, insulation levels, number of windows, roof type, and even where the sun hits in the afternoon all throw off the math. A north-facing unit might need less cooling power, but more precise control. A place with high ceilings might require a bit more capacity than expected, just to prevent heat from stacking above head level.
Look at heat load, not just size. What you’re trying to cool matters more than the raw square footage. South-facing windows without proper shades? That adds to the load. Finished basement with limited airflow? Different story. A formal calculation, called a Manual J load analysis, accounts for all of this–including local temperature swings. We’re talking days that hit 30°C and cool down by 15 degrees overnight. That kind of shift puts strain on underpowered equipment. If the system can’t keep up, it runs too long and doesn’t actually reduce humidity–which makes things feel worse, not better.
There’s also a comfort zone to think about. Some people like it cool enough to sleep under a blanket in July. Others are fine as long as it’s not stuffy. So while one person might need 18,000 BTUs to feel okay in a compact two-bedroom, their neighbour might be comfortable with 12,000. And honestly, personal preference throws the whole calculation off more often than insulation does.
We’ve had customers ask for smaller units to save power–then regret it by August. On the flip side, oversizing by too much leads to short cycles and uneven air distribution. So the best approach is: get a technician to measure properly. But if you’re trying to get a rough estimate yourself, err slightly on the higher side–but not too much. Somewhere in the middle usually lands best.
Installation Requirements for AC Units in Older Calgary Houses
Be prepared for a few extra steps when installing cooling in an older house. One of the main issues we run into is outdated wiring. Many homes built before the 1980s weren’t designed to handle the power load that modern cooling systems require. You might need to upgrade your electrical panel, especially if you’re planning to install a larger unit. Sometimes, it’s just an issue of adding a dedicated circuit, but it’s best to check with an electrician early in the process to avoid surprises.
Space for Outdoor Components

Older homes can also have tight spaces where outdoor components need to go. If your house has limited yard space or is close to other buildings, you may have to be strategic about where you place the condenser. It’s not just about finding room for the unit–it also needs to be placed in a spot where airflow won’t be restricted. If the space is cramped or surrounded by tall shrubs, it can lead to poor performance. And in some cases, access for maintenance becomes a problem.
Conduits and Piping Challenges
Another thing to think about is the path for the refrigerant lines and power cables. Older homes often have walls that aren’t set up for easily running these lines, especially in places like the second floor or in basements with low ceilings. This might mean some extra drilling and routing to get the lines to where they need to be. Not all homes are the same, so some custom solutions might be required to avoid visible pipes or holes in the walls.
All in all, these aren’t deal-breakers, but they’re good to know about upfront. Getting the right advice before installation will save you time and money–and help you avoid unexpected complications down the road. If you’re in an older property, it’s worth talking with a technician who has experience working with houses that weren’t built with modern cooling in mind. That way, you can avoid cutting corners that could affect the performance of the system later on.
Seasonal Maintenance Tasks to Keep Your AC Running Smoothly

Clean the filters regularly. It’s one of the easiest things you can do to keep your air circulation smooth. The filters catch dust, pet hair, and other debris, but over time, they get clogged and can affect airflow. You should clean or replace them at least once a season, especially before turning the system on for the first time in the summer. It only takes a few minutes, but it makes a big difference in how well your system runs–and it helps with energy efficiency.
Check the condenser unit outside. Calgary can get pretty windy, and that means debris–twigs, leaves, even the odd piece of trash–can get caught in the outdoor condenser. Blocked airflow reduces efficiency and could cause the system to overheat. Make it a habit to clear the area around the unit, especially after a big windstorm or during the fall when leaves start dropping. Just be careful not to hit the fins; they’re fragile and could bend easily if you’re too rough with them.
Inspect the refrigerant levels. Over time, refrigerant can leak, which leads to poor performance and higher energy bills. If you’re hearing a hissing sound, or if the air coming out of the vents isn’t as cool as it should be, it’s worth having a technician check the refrigerant levels. You can’t do this yourself unless you’re licensed, but it’s something to stay on top of. If the levels are low, the system may not run efficiently–or at all–until it’s topped up.
Clear the drain line. The moisture removed from the air has to go somewhere, and that’s where the drain line comes in. If it gets clogged with algae or dirt, you could end up with water backing up into the unit, which is a problem. Flushing the line with a mixture of water and vinegar once or twice a year helps keep it flowing smoothly. If you’re not sure how to do this, it’s something your technician can handle during a routine service visit.
Schedule a professional check-up. While DIY maintenance can go a long way, nothing beats a full inspection by an expert. Have a technician come in at least once a year to check the system’s performance, clean the coils, and make sure everything’s running as it should. An experienced technician will also spot potential issues before they become costly repairs. It’s an investment that pays off in the long run.
Contact “Calgary Air Heating and Cooling Ltd” For More Information:
Address
95 Beaconsfield Rise NW, Calgary, AB T3K 1X3
Phone
+1 403 720-0003
Hours of operation
Open 24 hours 7 days a week