Thermostat Set to Cool But AC Not Turning On: Troubleshooting

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Summer is in full swing, and the last thing you want is an air conditioner that refuses to turn on. When your thermostat is set to cool, but your AC unit remains silent, it’s not just frustrating; it can quickly turn your home into an uncomfortable sauna. At The Right Service HVAC, we understand the urgency of this situation. This comprehensive guide will delve into why your AC might not be turning on and how to troubleshoot the issue effectively.

Understanding the Problem

Before diving into solutions, let’s explore why your AC might not be kicking in:

  1. Thermostat Issues
  2. Power Supply Problems
  3. Clogged Air Filters
  4. Frozen Evaporator Coils
  5. Faulty Motor or Capacitor
  6. Refrigerant Leaks

Each of these problems requires a different approach. Identifying the root cause is crucial for a successful fix.

Detailed Troubleshooting Table

Problem Symptom Possible Cause Solution
Thermostat not working AC doesn’t turn on Dead batteries or faulty wiring Replace batteries or check wiring
No power to AC Silent unit Tripped breaker or blown fuse Reset breaker or replace fuse
Dirty air filter Reduced airflow Clogged filter Clean or replace air filter
AC unit freezing Ice on coils Blocked airflow or low refrigerant Check filters and call for refrigerant check
Motor issues Humming sound Burnt out motor Contact professional for repair
Refrigerant leak Hissing sound Leaking refrigerant Professional repair needed

Why Choose Us – The Right Service HVAC

At The Right Service HVAC, we are committed to delivering top-notch HVAC services. Our team of skilled technicians is equipped to handle any air conditioning issue, ensuring your comfort and satisfaction. Our service areas include:

  • Residential AC Repair
  • Commercial HVAC Solutions
  • Routine Maintenance Services
  • Emergency HVAC Services

Frequently Asked Questions

Why is my AC not turning on even though the thermostat is set to cool?

This could be due to a variety of reasons, including thermostat issues, power supply problems, or a malfunctioning AC unit. Begin by checking the thermostat settings and batteries. If these are fine, check the circuit breaker or the AC unit itself for any signs of trouble.

Can a dirty filter cause my AC not to turn on?

Yes, a dirty air filter can restrict airflow, causing the AC unit to overheat and shut down. Regularly cleaning or replacing your air filter can prevent this issue. Learn more about this on our air filter maintenance guide.

What should I do if my AC unit is frozen?

First, turn off your AC to prevent further damage. Check for blocked air ducts and replace any dirty filters. If the problem persists, it might be due to low refrigerant levels, requiring professional assistance. Visit our guide on unfreezing your AC unit for more details.

How often should I have my AC unit serviced?

Regular maintenance is key to the longevity of your AC unit. We recommend servicing at least once a year, ideally before the summer season begins. This ensures your unit is in top condition and prevents unexpected breakdowns.


Dealing with an AC unit that won’t turn on can be a daunting task. However, with the right knowledge and assistance, it’s a solvable issue. At The Right Service HVAC, we are here to provide you with reliable and efficient solutions for all your air conditioning needs. Don’t let a malfunctioning AC disrupt your comfort. Contact us for expert help, and explore our range of services to keep your home cool and comfortable. Remember, when it comes to your AC, always choose the right service – The Right Service HVAC.

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