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When it comes to air conditioning, bigger isn’t always better—and smaller isn’t always more efficient. One of the most common mistakes homeowners make when choosing a new air conditioner is overlooking the importance of proper sizing. At First Call Heating & Cooling, we’ve seen firsthand how the right-sized system can make all the difference in comfort, energy savings, and long-term performance.
What Does “AC Sizing” Mean?
AC sizing refers to the cooling capacity of your air conditioner, measured in BTUs (British Thermal Units) or tons. It’s not about the physical size of the unit, but how effectively it can cool the space in your home. A properly sized AC unit will efficiently remove heat and humidity, keeping your home consistently comfortable throughout the warmer months.
Why Bigger Isn’t Always Better
It might seem logical to choose a larger AC unit for faster cooling, but that approach can actually cause more harm than good. An oversized system will cool your home too quickly, resulting in short, frequent cycles. These rapid on-off cycles:
Increase wear and tear on your system
Fail to properly dehumidify your air
Lead to uneven temperatures across rooms
Can spike your energy bills
Over time, this can shorten the lifespan of your unit and make your indoor environment feel less comfortable.
The Problem with Undersized AC Units
On the flip side, a unit that’s too small for your home will run constantly as it struggles to keep up. This leads to:
Higher energy consumption
Increased stress on the system
Poor cooling performance
Hot spots and inconsistent comfort
An undersized AC won’t just leave you sweating—it’ll cost you more in energy bills and repair calls.
The Benefits of a Properly Sized AC System
At First Call Heating & Cooling, we take sizing seriously. Our team performs a thorough assessment of your home before making any recommendations. This includes evaluating:
Square footage
Insulation levels
Number and placement of windows
Ductwork and layout
Local climate considerations
A right-sized system offers better energy efficiency, longer equipment life, and more consistent cooling. It also improves humidity control—a key benefit for Portland homeowners dealing with both summer heat and damp air.
Trust Portland’s Cooling Pros
We’ve been helping families stay comfortable in Portland since 1939. Our team at First Call Heating & Cooling knows that a one-size-fits-all approach doesn’t work when it comes to AC systems. Whether you’re upgrading an old unit or installing a new system, we’ll ensure your AC is the perfect fit for your home.
Don’t leave your comfort to guesswork. Let us help you choose a system that delivers performance, efficiency, and peace of mind. Call (971) 328-7474 today to schedule your consultation.