DML & S Air Conditioning & Heating

DML & S Air Conditioning & Heating is a licensed HVAC contractor serving Nassau and Suffolk Counties on Long Island from a St James base. The company holds a home improvement license (50244-H), electrical license (50164-RE), and plumbing license (50165-RP). With 15 reviews yielding a 4.7-star average, the contractor maintains consistent praise for residential and commercial air conditioning and heating work. Operating hours run 8 AM to 4 PM Monday through Friday, with 24/7 emergency service available for urgent climate control failures.

The company distinguishes itself through comprehensive indoor air quality solutions including humidifiers and ventilation systems, plus traditional heating and cooling equipment. Their service menu covers ductless mini-split systems alongside conventional central air, plus gas and electric water heaters. The business offers maintenance contracts designed for ongoing system reliability and provides financing options for new equipment purchases. Rebates and specials appear periodically for qualifying installations, helping homeowners manage replacement costs.

Customer reviews consistently highlight technicians Donny and Mike by name, with one reviewer detailing a same-day response during a heat wave that restored comfort within 24 hours after their system failed. Another client described a repair relationship spanning 13 years, with the same technician returning to provide honest, timely service. Reviewers emphasize clean work practices, fair pricing, and a commitment to standing by their service. The technician Donny receives repeated mentions for reliability, competence, and integrity across multiple five-star evaluations.