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AC Won’t Cool the Whole House? Let’s Find Out What’s Wrong


As the summer heat ramps up, a well-functioning air conditioning system becomes essential for maintaining a comfortable home. However, when your AC won’t cool the whole house, it can be more than just a minor inconvenience—it can signal a deeper problem. 

Let’s dive into the common reasons why your AC might be failing to keep your entire home cool and what you can do about it. Rely on us for any AC repair in Williston, VT you may need.

Common Reasons Your AC Won’t Cool the Whole House

Blocked or Closed Vents

One of the simplest issues could be blocked or closed vents. If furniture or other objects block air vents, the cool air cannot circulate properly. Similarly, closed vents can disrupt the balance of airflow throughout your home.

Solution: Ensure all vents are open and unobstructed. Regularly check and clean them to prevent dust and debris buildup, which can also hinder airflow.

Dirty Air Filters

Dirty air filters are a common culprit behind inadequate cooling. When filters are clogged with dust and debris, they restrict airflow, causing your AC to work harder and less efficiently.

Solution: Replace air filters every 1–3 months, depending on your usage and the type of filter. This simple maintenance task can significantly improve your system’s performance.

Leaky Ductwork

Leaky ducts can lead to significant loss of cooled air before it even reaches your living spaces. This issue not only reduces your comfort but also increases energy bills as your system struggles to maintain the desired temperature.

Solution: Contact an HVAC professional to inspect and seal any leaks in your ductwork. Properly sealed ducts ensure that cool air is effectively distributed throughout your home.

Improperly Sized AC Unit

If your AC unit is too small for your home, it will struggle to cool all areas effectively. Conversely, an oversized unit can short-cycle, turning on and off too frequently without adequately dehumidifying and cooling your home.

Solution: Have an HVAC technician assess your home’s cooling needs and ensure your unit is appropriately sized. If it isn’t, the best course of action is a replacement.

Thermostat Issues

An incorrectly calibrated or poorly placed thermostat can result in uneven cooling. If the thermostat is in a location that is warmer or cooler than the rest of the house, it can give inaccurate readings.

Solution: Check your thermostat settings and ensure it’s placed in a central location away from direct sunlight or drafts. Upgrading to a programmable or smart thermostat can also enhance your system’s efficiency.

Aging or Malfunctioning AC Unit

Over time, AC units naturally wear out and become less efficient. Components such as the compressor, condenser, and evaporator coils can develop issues that impede the cooling process.

Solution: Regular maintenance and timely repairs are crucial. If your unit is over 10-15 years old and experiencing frequent problems, it may be time to consider a replacement. Modern units are far more energy-efficient and can provide better cooling.

How We Can Help

We specialize in diagnosing and fixing all types of AC issues. Our experienced technicians are equipped to handle everything from routine maintenance to complex repairs and system replacements. If your AC won’t cool the whole house, reach out to Red Rock Mechanical. Our reliable HVAC services will restore your home’s comfort and efficiency in no time. 

Red Rock Mechanical, LLC serves Northwest Vermont & Northeast New York. Reach out to us today to schedule HVAC services to keep your home cool this summer. 

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