HVAC & Retrofit Systems

HVAC & Retrofit Systems

Old House Online’s Directory of HVAC and retrofit systems for classically-designed or older homes. Specialties include retrofitting older systems for energy efficiency; heating & air conditioning repair; ventilation systems.

Hi-Velocity Systems

Energy Efficient Central Heating, Cooling and Indoor Air Quality Systems for over 35 years. The Hi-Velocity Small Duct System fits where others cannot, removing 30% more moisture from the air than conventional systems, and eliminating hot and cold spots in the home or office.


The only manufacturer of integrated heating, cooling and water heating solutions, including tankless, continuous hot water, an advanced hybrid water heater system, and residential pool and spa products.

Oneida Air Systems

(866) 387-8822 1001 West Fayette Street Syracuse, NY 13204 https://www.oneida-air.com/ Oneida Air Systems designs and manufactures industrial grade cyclonic dust collection systems and components in the United States. Our business is dust collection, nothing else. We are dedicated to the innovative design of industrial grade dust collection systems that help create a safe, healthy, and […]

Hutchinson Plumbing, Heating, and Cooling

(866) 953-8728621 Chapel Ave East Cherry Hill, NJ 08034https://www.hutchbiz.com/ Providing everything from emergency service to quality installations for your plumbing, heating and air conditioning needs to South Jersey and the Delaware Valley for over 60 years. Let Hutchinson provide its “Whole House” services to find you energy savings.

Sila Heating & Air Conditioning

https://www.sila.com/ Since 1989, we have been the area’s trusted source for quality heater and A/C services and repairs. We provide services to repair a number of residential heating systems, including air conditioning, generators, heating, heat pumps, and indoor air quality.

DK Heating & Sons, Inc.

(440) 510-3171http://dkhtg.com/ UL-approved, 120V/240V Warm-Touch® floor warming systems can be easily installed in renovations and new construction, under ceramic, stone, laminate, and carpeting. Luxurious accessories keep mirrors fog-free and towels warm and dry.

Unico System

A central heating and cooling system using “aspiration” technology to warm and cool homes evenly and quietly with flexible small ducts that weave through ceilings, walls, and even floors.


The total solution for central cooling and heating in ANY home or small business; regardless of structure design, age, size or type of construction.

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