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AC Sizing: Why It Matters

Air conditioning and heating system external units at the back of a house.
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Choosing the right air conditioning system for your home isn’t just about selecting a brand or energy-efficient model—it’s about getting the right size. Many homeowners believe that a bigger AC unit will cool their home faster, while others assume a smaller unit will save money on energy bills. Unfortunately, incorrect AC sizing can lead to inefficiency, discomfort, and higher costs.

At CPS Heating & Cooling, we specialize in properly sizing and installing AC systems for homes in Westborough, Newton, Shrewsbury, and the Boston Metro West area. Here’s why AC sizing matters and how it impacts your home’s comfort and energy efficiency.

The Impact of an Oversized AC Unit

Bigger isn’t always better. An oversized air conditioner may cool your home quickly, but it comes with several downsides:

  • Short Cycling – The system turns on and off frequently, leading to uneven cooling and excess wear on components.
  • Higher Energy Bills – Frequent starts and stops use more electricity, increasing utility costs.
  • Poor Humidity Control – The AC doesn’t run long enough to properly remove moisture from the air, making your home feel damp.
  • Reduced Lifespan – Excessive cycling leads to premature wear and tear, meaning you’ll need a replacement sooner.

The Problems with an Undersized AC Unit

On the other hand, an AC that’s too small struggles to keep up with demand, leading to issues such as:

  • Constant Running – The system works overtime, leading to higher energy consumption and stress on the components.
  • Inconsistent Cooling – Some areas of your home may remain warm, leaving you uncomfortable.
  • Faster Wear and Tear – Overworking the unit shortens its lifespan, leading to frequent breakdowns.

The Key to Proper AC Sizing

At CPS Heating & Cooling, we take precise measurements to ensure you get an AC unit that fits your home perfectly. Our NATE-certified technicians use the Manual J Load Calculation, a professional method that considers:

✔ Square footage of your home
✔ Insulation levels
✔ Number of windows and doors
✔ Local climate conditions
✔ Ductwork efficiency

Benefits of a Properly Sized AC System

When your AC unit is just the right size, you’ll experience:

✅ Consistent Comfort – Even cooling throughout your home, with no hot or cold spots.
✅ Lower Energy Costs – A properly sized unit runs efficiently, reducing utility bills.
✅ Longer System Life – Less strain on components means fewer repairs and a longer lifespan.
✅ Better Humidity Control – Proper run times help maintain ideal indoor air quality.

Get Expert AC Sizing & Installation

Choosing the right AC size is crucial for comfort and efficiency. At CPS Heating & Cooling, we take the guesswork out of AC sizing and ensure your system perfectly matches your home’s needs.

📞 Call us today at (508) 501-8848 to schedule a consultation and get the right AC for your home!

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