Proudly serving families in Massachusetts and New Hampshire since 1946!

Schedule Repair Service & Save $25

24/7 Heating and Cooling Repair ServicesWe service all makes and models of heating and cooling equipment with no extra for nights or weekends! Schedule online and save $25. Schedule Repair Service »

Get a Free In-Home Estimate

HVAC Sales & InstallationGet 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 »

Request Service

Fill out the form below and we'll be in touch ASAP!






Important: If you are without heat or air conditioning & need an emergency service, CALL, do not e-mail your request. We have professional field representatives on-call 24/7. Please call the number listed at the top of our website.

Climate Design Systems

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.

  • Over 70 Years in Business
  • A+ BBB Rating
  • Fully Licensed, Bonded, & Insured
  • Available 24/7
  • No Extra Charge for Nights/Weekends
  • NATE Certified Technicians
We Service All Makes and Models

HEATING

Heating Repair & Installation

Stay warm and save money all winter long!

We provide 247/7 furnace repair, maintenance, and installation to keep you warm and comfortable during the harsh New England winter.

Choose from a wide variety of Lennox Furnaces, Boilers, and Heat Pumps with great energy efficient models. Need repair or maintenance on your furnace or heating system? No problem! Our fleet of over 75+ vehicles is available 24/7 to help with all of your heating needs.

To get started, please choose from the options below:

AIR CONDITIONING

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.

To get started, please choose from the options below:

COMMERCIAL

Commercial HVAC Service

Your one stop shop for professional mechanical, design and build services

Our commercial services/industrial division of Merrimack Valley Corp. Mechanical Contractors provides:

  • Fabrication
  • Design
  • Repair Service
  • Maintenance

Click here to learn more about our commercial services division.

AIR QUALITY

Air Quality

Increase home comfort with our full line of indoor air quality products

Studies have shown that indoor air can be up to 5X more polluted than the air outdoors. Modern homes and buildings are sealed tightly to conserve energy. This helps keep energy costs down, but it also seals in toxins (household cleaners, etc.) mold, pollen, bacteria, pet dander and other pollutants. We offer a full selection of Healthy Climate indoor air quality products to improve the indoor air quality of your home.

Choose from:

Ready to get started? Our fleet of over 75 service vehicles is in your area!

Call us 24/7 for Quick and Reliable HVAC Repair Service

What Our Customers Are Saying...

Your call center ensured I had a technician sent out immediately that was professional and could fix the issue. They were kind and sympathetic to the issue - and made me feel 100% comfortable that your company would ensure the situation was taken care of appropriately.

Karen

EverettMA
On May 11th your company installed a heat pump air handler in my unit. The two gentlemen who did the work were great! Both of these men did such an excellent job that I felt it warranted a letter letting you know that you have two highly skilled employees who are both professional and respectful and who go beyond what's expected. I feel very comfortable recommending your company to my neighbors and friends.

Teresa

NorthAndoverMA
I am writing this note...to let you know what a great job your team did with our central AC installation. Your repair technician was one of the hardest working, diligent, and most dedicated workers I have ever seen. I am an HR Director and interview/hire people on a daily basis and he was really one of the most dedicated and caring people I have seen in a very long time.

Stephanie & Michael

NorthAndoverMA
Your service didn't make me feel stupid because I didn't completely understand the technical jargon. He made sure that he showed me everything he did and helped me understand how it all worked together. This is a very special quality in a service person. I wish all service people were like him.

Linda

HaverhillMA
My wife and I have nothing but the highest praise for all of your personnel who recently assisted us when our furnace suddenly had to be replaced. We were in the midst of an unexpected emergency over which we had no control, at the mercy of a company previously unknown to us. We can't remember another time when we have experienced such top service by people who could not have been better at their work or more considerate of us. We are deeply grateful to all of them. You are lucky to have them carrying your name forward!

Donald

AndoverMA

View More Customer Testimonials

visit Us: 15 Aegean Dr., Unit 3 Methuen, MA 01844
email us: [email protected]
24/7 Emergency call 978-689-8312