Best Heating & Air Conditioning / HVAC In Holtsville

“Twin Air did an amazing job installing our system. They were quick, very neat, and did quality work! Highly recommended!!!“

“Anthony was here today and had to replace a valve on baseboard. He was very efficient, professional and courteous and fast ..... I remain a loyal customer with a great company and recommend John's Fuel Oil to everyone. Sincerely, Connie Rae Aldrich“

“Wonderful crew, curteous, clean and extremely polite. John and his crew are on top of their game.“

“I can’t say enough good things about Ferrelli Mechanical LLC! From start to finish, their team was professional, prompt, and highly knowledgeable. My HVAC system was on the fritz during a cold snap, and they came to the rescue.

The technician arrived right on time, quickly diagnosed the issue, and clearly explained the repair process. I was impressed by their honesty and transparency—no hidden fees or unnecessary upselling. They had the system up and running in no time, and the price was very reasonable for the level of service provided.

What stood out most was their attention to detail and customer care. They treated my home with respect, cleaned up after themselves, and even followed up a few days later to ensure everything was working smoothly.

If you’re looking for a reliable, trustworthy HVAC repair company, Ferrelli Mechanical LLC is the way to go. They’ve earned a loyal customer, and I’ll be recommending them to everyone I know!“