SIGMA Mechanical Services is a full service heating, ventilation, air conditioning, refrigeration, and plumbing company serving Marshfield and the surrounding area.

We’re fully insured and licensed. Our technicians are fully trained on state of the art technology for all existing systems. All of us at SIGMA Mechanical Services are deeply committed to your satisfaction.

Let the “SIGMA boys” maintain or repair your Central Air Conditioning Units. 
SIGMA Mechanical Services is currently focusing on commercial plumbing services.
Give us a call to service, replace or perform maintenance on any Natural Gas Equipment you have. We specialize in Oil to Gas Conversions and are Columbia Gas’ recommended Contractor in The South Shore Area.
The EPA has named indoor air pollution as one of the top five environmental risks to public health.  Between the car, work and home we’re breathing artificially controlled air most of the day. Is it clean and safe? Proper ventilation will keep your  family safe from dust, radon, lead, and other heavy particles. Read our Blog on Indoor Air Quality Here. 
Whether it’s new construction, remodeling or servicing your current refrigeration system—SIGMA Mechanical Services has the expertise to exceed your expectations.
The best way to deal with a potential emergency is to remove the possibility of it ever happening. The question isn’t if you need a generator, but rather which size you need. Read More On Whole House Generators Here. 
Performing Preventative Maintenance is the best way to keep your system tip top. With Preventative Maintenance we offer 10% off any service call for the season, along with preferred service during an emergency. Seasonal Tune-Ups lower operating costs, and can save you up to 30% on energy costs.
Our fully trained technicians will keep your family comfortable all winter long. We service any brand. We’re Carrier Factory Authorized Dealers and Mitsubishi Diamond Dealers, specializing in the installation of Furnaces, Electric Heat Pumps, Radiant Heat, Gas Conversions, and On-Demand Water Heaters. If you don’t see something here, give us a call most likely we can help you out, or set you in the right direction.


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Carrier Factory Authorized Dealers are described best in three words. Done. Right. Guaranteed. 

To become a Factory Authorized Dealer, we must meet national standards not only continuously, but consistently. We are also required to take part in extensive training on installations, repairs and maintenance on top of extensive learning of all Carrier equipment. This will guarantee that, when entering homes, our sales department is able to accurately and efficiently determine what would cater best to each individual’s needs. Talk to the experts and feel confident that you are being taken care of.

Mitsubishi Diamond Contractors are members of a select group of elite HVAC experts who recognize that a partnership with Mitsubishi Electric comes with significant advantages.

In order to be recognized, a distributor must nominate the company, we must sign a code of conduct, complete the 2 day course and sell a minimum of 20 systems annually. This demonstrates to our customers that we have achieved an exceptional level of training, expertise, and customer satisfaction, making us experts on the Mitsubishi products and services.