What Should The Air Conditioner Be Set At In Summer?
As Calgary warms up, thermostat debates usually follow, especially when you are trying to stay comfortable without overworking your system. The truth is, there is no single perfect number for every home because insulation, sun exposure, airflow, and personal comfort all change the result. This guide provides a reliable starting temperature, a simple method to find your household’s sweet spot, and practical habits to reduce AC strain. If you are comparing HVAC options in Calgary, this will also help you recognize when it is time to book service.
What Temperature Should I Set My Air Conditioner To In Summer?
A practical starting point for indoor summer temperature is around 25–26°C. Natural Resources Canada recommends choosing the highest setting that still feels comfortable, then adjusting from there based on humidity, sun exposure, and airflow
If your home feels clammy or uneven at a lower setting, the issue may not be the number you chose. It may be airflow, sun exposure, or a maintenance issue that needs attention.
How Do I Find The “Sweet Spot” Without Everyone Arguing?
Try a simple experiment that keeps comfort front and centre:
- Pick a starting point (many households start at 24°C).
- Hold it for 48 hours so everyone can judge comfort consistently.
- Adjust by 1°C at a time, then hold for 48 hours again.
- When someone notices discomfort, go back 1°C and keep it there.
This works better than repeatedly adjusting the thermostat. It also reduces “thermostat whiplash,” where some rooms feel too cold while others still feel warm.
Should I Raise The Temperature When I Leave The House?
Often, yes. If you are away for a few hours, letting the temperature rise a little can reduce unnecessary cooling. Many homeowners use a smart thermostat schedule to raise the setpoint when the house is empty and cool it down before everyone returns.
If you are browsing for Calgary HVAC services, ask whether your thermostat supports scheduling and whether a smart thermostat would improve your comfort and routine.
What Matters More Than The Exact Temperature?
The setpoint is only part of the comfort equation. These habits often make a bigger difference than dropping the temperature:
- Block peak sun: close blinds or curtains on sun-facing windows during the hottest hours.
- Move air in occupied rooms: a fan can help a room feel more comfortable without lowering the thermostat.
- Reduce indoor heat: avoid running the oven, dryer, or other heat-producing appliances during peak afternoon heat when possible.
- Use exhaust fans: run kitchen and bathroom fans during cooking and showers to remove heat and humidity.
If your home has a persistent hot upstairs or a warm west-facing room, that is normal in many layouts. The goal is to manage heat gain and airflow rather than forcing the AC to do all the work.
If you are shopping for equipment, EnerGuide labels can also help you compare efficiency across models, so you are not guessing when reviewing options.
Why Does My AC Run A Lot, But Some Rooms Still Feel Warm
This is a common Calgary complaint, and it is usually about airflow or distribution:
- A closed or blocked return grille can reduce circulation.
- A dirty filter can restrict airflow.
- Some rooms may need balancing adjustments to deliver more supply air.
- Duct leakage or restrictions can keep cool air from reaching certain areas.
If your system is paired with a furnace blower, the AC still depends on the same ductwork and airflow paths. Comfort problems can sometimes show up as “AC problems,” even when the real issue is airflow or ductwork. If you are comparing AC and furnace deals in Calgary, ask what is included and whether airflow is being assessed, not just equipment swapped.
Can I Do Anything Myself To Help My AC Cool Better?
Yes, there are a few safe homeowner checks that can improve airflow and reduce strain.
Homeowner OK
- Replace or clean your air filter on schedule.
- Keep supply vents and return grilles clear (no furniture or rugs blocking them).
- Confirm the thermostat is set to Cool and the fan setting matches your preference.
- Keep the outdoor unit clear of grass clippings and debris (power off first).
Pro Only
- Measuring airflow and static pressure.
- Electrical diagnostics and control testing.
- Refrigerant handling and charge verification.
- Duct sealing, balancing, resizing, or adding returns.
If you have weak airflow, large room-to-room temperature differences, or loud returns, it is worth having your airflow checked. In many cases, comfort issues are caused by airflow, not the thermostat setting.
When Should I Book An AC Tune-Up In Calgary?
Book before peak summer demand, when calendars fill up. A service visit can take about an hour or so, depending on the system and what is found.
It is smart to book sooner if you notice:
- AC runs constantly but struggles to reach the set temperature.
- You hear new noises or notice short cycling (frequent starts and stops).
- You see ice, leaks, or very weak airflow at vents.
- Your home feels humid or “sticky” even when the AC is running.
This is where HVAC maintenance can help. A tune-up can identify small issues early and confirm the system is operating as intended.
A Simple Next Step
If you are not sure where to set your thermostat, start at 24°C and adjust in 1°C steps until your home feels right. If your AC cannot hold temperature, runs all day, or you have airflow issues from room to room, Knight Plumbing can assess the system and explain what is actually driving the problem, whether that is maintenance, airflow, or a repair. If you need HVAC repair support in Calgary, it helps to address small performance issues before they become mid-summer breakdowns.
Book an AC check or tune-up, and ask about our HVAC Maintenance Plans for predictable seasonal upkeep.