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When it comes to air conditioning, bigger doesn’t always mean better. One of the most important—and often overlooked—factors in achieving optimal indoor comfort is having the right-sized AC unit for your home. At Brennan Heating, Air Conditioning, Plumbing, and Electrical, we’ve helped countless homeowners across Western Washington avoid common AC sizing mistakes and enjoy more efficient, longer-lasting comfort.
What Is AC Sizing?
AC sizing refers to the cooling capacity of your air conditioner, typically measured in BTUs (British Thermal Units). This number determines how much heat the unit can remove from a space in one hour. Selecting the right size depends on multiple factors including square footage, ceiling height, insulation quality, number of windows, sun exposure, and even how many people live in your home.
Why Size Matters
1. An Oversized AC Unit Wastes Energy
While it might seem like a larger system would cool your home faster (and it might), that quick cycle often leads to a problem called “short cycling.” The system turns on and off frequently, using more energy and causing unnecessary wear and tear. This can also result in uneven cooling, where some rooms feel chilly while others stay warm.
2. An Undersized AC Unit Struggles to Keep Up
Too small, and your system works overtime to meet your cooling demands. This not only drives up your energy bills but can also shorten the lifespan of your unit. An undersized unit may also fail to properly dehumidify your home, leading to discomfort and poor indoor air quality.
3. Comfort and Efficiency Go Hand in Hand
At Brennan Heating, Air Conditioning, Plumbing, and Electrical, we understand that comfort isn’t just about temperature—it’s about consistency, airflow, and humidity control. A properly sized AC system delivers balanced cooling, helping your home stay comfortable without driving up energy costs or overworking your equipment.
How We Help You Get It Right
Our experienced technicians don’t rely on guesswork or one-size-fits-all solutions. We perform detailed load calculations to determine exactly what your home needs based on its unique layout and environment. Whether you’re upgrading an outdated system or installing AC for the first time, we’ll walk you through your options and recommend the perfect fit.
Trust the Local Experts
With decades of experience serving Seattle and the surrounding communities, Brennan Heating, Air Conditioning, Plumbing, and Electrical is proud to be the AC contractor homeowners trust. We treat every home with care, every customer with respect, and every installation with precision.
If you’re unsure whether your current system is the right size or you're ready to upgrade, give us a call at (206) 222-7674. We’re here to help you stay cool, comfortable, and confident in your investment.