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We service all makes and models of heating and cooling equipment with no extra for nights or weekends! Schedule online and save $50. Schedule Repair Service »
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Get a free in-home estimate on a new air conditioner, furnace, boiler, or heat pump! Ask about our new rebates and attractive financing offers! Schedule a Free Estimate »
Residential Heating & Air Conditioning Services
Experienced and polite repair technicians, up-front pricing, and a commitment to total customer satisfaction are just a few of the reasons that residents in the Merrimack Valley and surrounding areas trust their home comfort to Climate Design Systems. We are a full service HVAC contractor specializing in the repair, maintenance, and installation of residential heating and air conditioning systems.
Nobody plans on having a heating or cooling emergency, and we realize this can be a very stressful situation. Our staff of 150+ employees and over 75 service vehicles are ready to provide immediate service 24/7 and will work with you every step of the way to ensure total customer satisfaction.

Air Conditioner Repair & Installation
Beat the heat with our affordable cooling services!
Whether you are in need of a quick A/C repair, maintenance, or the installation of a new unit, our trained professionals have you covered!
We offer a full line of Lennox Air Conditioners with great energy efficient models that are also provide quiet operation. Need repair or maintenance on your existing A/C? No problem! We’re available 24/7 for all of your cooling and home comfort needs.
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