To Our Valued Customers,

Climate Design Systems, LLC has committed itself not only to staying open through this crisis, but doing so in the most responsible way possible. Our focus has been on educating and stream lining our process to meet the needs of our customers. All of our field employees are being provided with Face Mask, Gloves, Booties, and Sanitizer, and when possible are being directed not to enter the home at all. We offer completely contact-less service, with billing taking place electronically. Please call (978) 566-3251 to find out more about how we are working to keep our community safe.

Climate Design Systems, LLC wants to make you a PRIORITY!

Sign up for a NEW Priority 1 Agreement membership
(2 year & monthly options available)
and you will instantly be entered into a drawing for a
VIZIO 43″ Smart TV
*some restrictions may apply

What are the benefits of being a member?

1 Maintenance per year for heating and/or cooling system


  •  Up to 30% off repair service and discounts on accessories(Discounts taken at time of sale)
  • Preferred discounts for equipment and accessory installation
  • Discount on material & labor for repairs
  • Reduced rate on trip charge
  • Never an overtime charge
  • 24-hour emergency service
  • Priority customer status
  • Inflation protection
  • Fewer repairs*
  • Improved capacity*
  • Extended equipment life*
  • Lower utility bills*
  • Improved safety
  • Emergency service or you don’t  pay (Within 24hrs or diagnostic is waived)
  • Agreement is transferable

Raffle entry dates:

Raffle Entry dates: November 1, 2020 through December 15, 2020

Any customer who signs up for a NEW Priority 1 Membership with the dates above will have an instant raffle entry.

Prize to be delivered by Climate Design Systems, LLC employee after drawing on December 16, 2020.

  • Only 1 raffle entry per customer, per location.
  • Only for NEW Priority 1 members.
  • Moving to a new location does not qualify as a NEW membership.
  • If no previous membership within past 5 years, you may qualify for raffle entry.
  • Other restrictions may apply.

Schedule Repair Service & Save $50

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 $50. 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.

We Service All Makes and Models

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:

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...