System Short Cycling
PriorityHVAC system turning on and off frequently without completing full cycles.
Short cycling wastes energy, reduces comfort, and accelerates equipment wear. Every startup stresses compressors and motors. The cause must be identified and corrected. Oversized equipment is a common cause that requires either system replacement or modifications. Other causes are more easily resolved.
Symptoms to Look For
Possible Causes
What You Can Check
Before calling for service, try these safe checks that may resolve simple issues:
When to Call a Professional
Short cycling stresses components and needs professional diagnosis. The underlying cause could be minor (dirty filter) or major (oversized equipment, failing compressor). Prompt attention prevents accelerated wear.
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Prevention Tips
Frequently Asked Questions
What is considered short cycling?
Normal cycles last 15-20 minutes with 2-3 cycles per hour. Short cycling involves cycles under 10 minutes with 4+ cycles per hour. Frequent starting and stopping indicates a problem.
Can an oversized system cause short cycling?
Yes. Oversized equipment cools or heats quickly, satisfying the thermostat before completing a proper cycle. This is a common issue when systems are replaced without proper load calculations.
Is short cycling damaging my system?
Yes. Startup is the hardest on compressors and motors. Frequent cycling accelerates wear and can lead to premature failure. It also increases energy costs and reduces comfort.
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