Can you run your AC and heater on the same day? Yes, but you need to know how to switch between AC and heat and back again properly. If not, you can risk damaging your HVAC system.
A Step-by-Step Guide on How to Properly Switch
By following this step-by-step guide for properly switching your thermostat settings from AC to heat and back, you’ll avoid many issues.
- Place your thermostat to “auto.”
- Wait for the HVAC system to complete its current cycle.
- Once it stops, you can turn the thermostat settings to “off.”
- Wait five minutes.
- Switch to the other system.
- Set your thermostat close to the current indoor temperature.
- You can gradually adjust your settings by five degrees.
It’s extremely important to wait at least five minutes before you switch between AC and heat or vice versa. If you don’t, your compressor can malfunction. This causes the system to work harder and can create more extensive problems.
Slowly switching from one function to the other ensures that you don’t run heating and cooling equipment at the same time. This would put too much stress on your system and reduce energy efficiency. Keep in mind that your indoor temperature won’t instantly change. It takes time for the temperature to settle.
Short Cycling and Why It’s Harmful
Frequently switching between your AC and heater on the same day can potentially cause your HVAC system to short-cycle. Short cycling refers to the system turning on and off frequently without completing a full heating or cooling cycle. This can lead to potential damage and inefficiency.
Those quick switches also shock your HVAC system, especially if the thermostat is set at extreme temperatures. Completing cycles is necessary for proper air distribution and temperature regulation. Frequent starts and stops put extra strain on the HVAC system’s components, which can shorten the system’s lifespan.
Ensure Your HVAC System’s Performance and Longevity
There are HVAC tips that ensure the performance and longevity of your system when switching from the AC to the furnace on the same day. Consider installing a smart thermostat that you can program with your preferred thermostat settings. This also helps you avoid overheating or cooling empty rooms when you’re not home.
Make sure your air filters are clean so your system doesn’t work harder. Check them regularly and clean or replace them as necessary.
The Benefits of Proper Switching
It happens every spring and fall. You’ll have days where you’ll start out chilly, only to suddenly find yourself dealing with afternoon heat. If you follow the proper procedures for adjusting your HVAC system accordingly, you’ll enjoy more comfort as well as the following benefits.
Protection for Your HVAC System’s Compressor
By learning to properly run the heat and air conditioning in your home, you’ll avoid short cycling, which increases the stress on your system’s compressor motor. The compressor motor draws the most power during startup. Frequent starts and stops result in the motor constantly working harder than it would during longer cycles. Proper switching eliminates this stress, helps the system avoid overheating, and prevents accelerated wear.
When the compressor stops, the pressure in the refrigerant lines won’t immediately equalize. If you quickly switch from the furnace to the air conditioner, it’ll prevent this equalization. This means that the compressor must work against a higher pressure during the startup, which increases the strain on the motor and potentially causes damage. Proper switching avoids these issues.
A Longer System Lifespan
Properly switching your HVAC system between heating and cooling cycles is important for longevity. Constantly switching, especially if not done gradually, will cause the system to work harder. This leads to premature wear and tear on major system components.
Avoid Moisture Buildup
When you frequently switch from heating and cooling without following the proper procedure, the evaporator coil may still be wet. This moisture can evaporate and lead to humidity in your ductwork. As a result, you can experience mold and mildew issues.
Benefits of HVAC Maintenance
In addition to following proper procedures for switching from one function to the other, you’ll want to schedule routine HVAC maintenance. This is a great way to get ready for the changing weather. By proactively preparing your system, you’ll ensure it operates at peak performance and energy efficiency. You’ll consume less energy and still maintain a comfortable home.
Here at Cranney Home Services in Salem, we offer HVAC maintenance, repair, and installation to help you keep your home comfortable all year long. We have over 40 years of experience providing air conditioner, furnace, heat pump, and boiler service. You can count on us for a 100% satisfaction guarantee and flexible financing options on approved credit. We have an A+ rating from the BBB, and we’re a Salem News Best of 2025 award winner.
Call Cranney Home Services today for more information in Salem.