HI TECH PTAC SERVICES INC. We provide HVAC, PTAC services for residential and commercial customers throughout Manhattan, Brooklyn, Queens, Nassau and Suffolk Counties. We are Specializing in HVAC, emergency service and repairs, we have assisted numerous customers with maintaining a comfortable atmosphere for their home or business. We offer free estimates on new installations for HVAC and PTAC Units. We deal in preventive maintenance, service agreements, and 24-hour emergency services in NYC.