As the temperatures drop and winter sets in, many building owners and homeowners wonder whether they should shut down their rooftop air conditioning (AC) units completely. It seems logical — after all, the system won’t be used for cooling in the colder months. But is powering it off entirely the best decision?
Let’s explore the pros, cons, and best practices to help you make an informed choice.
1. Energy Savings:
Even in standby mode, rooftop units can draw a small amount of power. Fully switching off the system eliminates this phantom energy consumption, contributing to lower utility bills.
2. Protection from Weather Damage:
Shutting off your unit can help prevent potential damage from freezing temperatures or winter storms. If your system has a water-cooled component or a humidifier, freezing water inside the lines can cause cracks or leaks.
3. Prevent Unnecessary Wear:
Many rooftop systems include heat pumps or multi-function settings. If not configured correctly, the system could cycle on unnecessarily during mild winter days, causing wear and tear.
1. Integrated Heating Systems:
Some rooftop units serve both cooling and heating needs. If your unit includes a heat pump or gas heating element, turning it off completely could leave your building without heat.
2. Frozen Components:
Turning off the system may stop important features like crankcase heaters (used to keep oil warm in compressors). Disabling this can allow condensation and freezing inside components — leading to costly repairs.
3. Maintenance Oversight:
When a system is off and out of mind, it’s easy to forget regular maintenance. A dormant unit can become a home for rodents or collect debris and rust, especially on flat rooftops where drainage is poor.
If your rooftop unit doesn’t serve heating needs, here are safe alternatives to fully powering it down:
Don’t turn it off completely unless your unit is cooling-only and has been winterized by a professional. In most cases, it’s better to leave the system in an idle or standby mode to preserve functionality and avoid damage.
Remember: A rooftop AC unit is a long-term investment. Protecting it during the off-season ensures reliable performance and reduces the risk of costly repairs come summer.
Need help winterizing your AC system?
Contact our HVAC professionals today for a full winter checkup and peace of mind all season long.
