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Sizing Considerations for Buying an Air ConditionerAir conditioner sizing is a critically-important consideration when you're planning to purchase new cooling equipment. According to the U.S. Department of Energy (DOE), an A/C's size needs to match the space it's going to cool. An undersized A/C will run for extended periods, use a lot of energy, but won't cool your home's interior sufficiently for comfort. An oversized air conditioner will only run for short cycles, so it won't dehumidify effectively or cool your living space efficiently.

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HVAC system , air conditioner , Tips , HVAC , air conditioner efficiency , air conditioner sizing

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"I was very pleased with the quickness of them getting here and fixing my thermostat so I could turn on my heat. Professional and communication was great! Thank you!!"

— Lucinda E.
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"I had an excellent experience with Hartman Brothers from start to finish. After dealing with an incomplete and frustrating repair from Peterman Brothers, Hartman Brothers was a breath of fresh air. Their technician spent several hours thoroughly troubleshooting my tankless water heater, walking through the issues clearly and professionally. There was no upselling, no pressure, and no shortcuts—just honest, methodical work. Based on their findings, I chose to upgrade to a new tankless water heater, and the decision was entirely mine. At no point did they try to push a sale or steer me toward anything unnecessary. The installation was clean, the communication was excellent, and the entire process felt transparent and trustworthy. It’s clear why they have such a strong reputation in the Fort Wayne area. Their professionalism, responsiveness, and genuine customer‑first approach really stand out. I’m very happy with the new system and with the service I received. "

— Cory T.
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"Very nice people and reasonably priced and such nice service techs would recommend to anyone."

— Vicky S.
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"Technician was on time, professional and completed our HVAC service promptly. Would highly recommend Hartman Brothers!"

— Eric Korte
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"I have depended on this company for years, they are great to work with."

— Kim Wroblewski
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"Called and they came out same day,…and it was day after Thanksgiving. Service man was very informative and thorough. Definitely recommend Hartman and we plan to use them for maintenance and future furnace or ac needs."

— Traci N.
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"Furnace wasn’t working on Friday morning after thanksgiving. Called Hartman Brothers. They were able to get here in the early afternoon. They diagnosed the problem and got it fixed quickly. Communication was excellent. Price was more than I expected, but understand that parts for 20+ year old furnace are not inexpensive."

— Brad S.
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"I have used Hartman Brothers for many years. I have never had a problem. Top notch folks!"

— John Wiesemann
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