We are committed to our customers and the work we perform. We build long-standing relationships through fairness, reliability, and trust while providing a full array of heating, air conditioning, and home comfort solutions. Climate Design Systems, originally founded in 1946 under the name of Haverhill Sheet Metal, is a full-service heating, air conditioning and indoor air quality contractor serving the Methuen, MA and Manchester, NH areas. We are locally owned and managed by some of the most experienced HVAC specialists in the Northeast.