Is a Bigger HVAC actually better? (insert joke here)

One of the most common misconceptions among Phoenix homeowners is that a bigger HVAC system means better cooling. In reality, an oversized system can cause just as many problems as one that’s too small.

HVAC system size is measured in tons (or BTU's, one ton is 12,000 BTU's), which refers to how much heat the system can remove per hour. Choosing the right size depends on more than square footage — insulation, ceiling height, window exposure, duct design, and home orientation all matter.

Oversized systems cool the home too quickly, causing short cycling. This leads to uneven temperatures, higher humidity, increased wear on components, and reduced efficiency. Undersized systems, on the other hand, struggle to keep up during extreme heat and run continuously, driving up energy bills.

In Phoenix’s climate, proper sizing is critical. A correctly sized system runs longer cycles, maintains consistent comfort, and handles heat more efficiently during peak summer months.

Professional load calculations called a "Manual J Load" ensure the system matches your home’s actual cooling demand. This not only improves comfort but also extends system lifespan and reduces long-term operating costs.

If you’re considering replacing your HVAC system, proper sizing is one of the most important decisions you’ll make — and one that should never be based on guesswork. Make sure your HVAC contractor is running a Manual J Load Calculation before replacing your unit, not just swapping your unit for the same size that was there.

One last thing: be sure to discuss hot and cold spots with your contractor. We can adjust the airflow to specific areas of your home, and it's much easier to do it right after we install a new unit. You can usually negotiate that into the price (It's called balancing).

Hope that helps!!

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