Established in 1994, Mac Heating and Air Conditioning has become one of the best rated oil companies on Long Island. This family owned business truly brings to the table what a large corporation can’t. “We treat all of our clients like they are family” says Bill & Donna Maclay. They truly work with you to find best solution for your home within your budget. Their goal is to make your heating and air conditioning installation and service stress free knowing that they have your best interest in mind. MAC Heating and Air Conditioning offers both COD spot price oil delivery and Oil Contracts to their Nassau and Suffolk County customers.