Donlon Brothers Heating and Cooling | Best HVAC Services in Yaphank, NY

If you notice your AC isn't cooling properly, ice on the coils, or a hissing sound, you may have a leak. First, turn the system off to prevent further damage. Then, call Donlon Brothers. Our technicians use advanced electronic leak detectors to find the source quickly and safely. We'll repair the leak, perform a pressure test, and recharge your system with the correct amount of refrigerant to restore peak efficiency and protect your compressor.

Improper installation is a leading cause of high energy bills, uneven temperatures, and frequent breakdowns. Our Yaphank climate demands systems sized and installed correctly for your specific home. Donlon Brothers follows strict, manufacturer-recommended procedures—from ductwork sealing and refrigerant line sizing to ensuring proper airflow and thermostat placement. A right-sized, precision installation maximizes comfort, improves indoor air quality, and extends the life of your equipment, saving you money for years to come.

We recommend a professional tune-up twice a year: once in the spring for your cooling system and once in the fall for your heating system. This seasonal maintenance is crucial for catching small issues, like early signs of refrigerant leaks or electrical problems, before they become major repairs. Our service includes cleaning critical components, checking refrigerant levels, testing safety controls, and ensuring everything operates safely and efficiently through our hot summers and cold winters.