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We’re proud to serve customers across Southern New England. Our service areas include Rhode Island, South Eastern Massachusetts, and the Greater Boston area. This includes: Norton, MA; Easton, MA; Sharon, MA; Stoughton, MA; Attleboro, MA; North Attleboro, MA; Wrentham, MA; Foxboro, MA; Canton, MA; Plainville, MA; Taunton, MA; Seekonk, MA; Rehoboth, MA; Bridgewater, MA; Raynham, MA; Walpole, MA; Norwood, MA. To learn more about how we can help you, please contact us to schedule a call.

Yes! We specialize in heating system repairs. In addition, we offer a comprehensive range of other services you may need: 

• System diagnosis 
• Troubleshooting
• Installations
• Much more

We do! In addition to specializing in repairs, we offer a variety of ways to keep you cool:

• System diagnosis 
• Troubleshooting
• Installations 
• Commercial rooftop units

Some of our brands include: Mitsubishi Electric; LG; Fujitsu; Tosot; Daikin; Gree; Goodman; Carrier; Bosch; Bryant; Trane; American Standard; Lennox; Rheem; and Ruud heat pumps or air conditioners.

Yes, we are. O’Neal Plumbing and HVAC Solutions is licensed and insured in Rhode Island and Massachusetts. We carry liability insurance, as well as workman’s compensation.

Yes, we are available to install all fuel types of tankless systems- Navien; Rinnai; Bosch; Lochinvar and more!

Because our groundwater in Southeastern Massachusetts contains natural mineral deposits, annual maintenance is mandatory to protect your manufacturer’s warranty.

Annual Descaling Flush: A professional must hook up a specialized pump loop to circulate a food-grade descaling solution through the stainless steel or copper heat exchanger to remove calcium buildup.

Filter Cleaning: The inline water inlet filter and air intake screen must be checked and cleared of debris.

Component Diagnostic: Gas pressure, venting integrity, and electrical sensors should be verified once a year to ensure peak operation.

If you are planning to upgrade your central air conditioning or switch your home to an energy-efficient heat pump system, it is easy to get caught up in brand names and equipment prices. However, the most critical factors dictating whether your new system actually keeps you comfortable and operates legally happen long before a single truck rolls into your driveway.

In Massachusetts, proper climate design requires strict adherence to two things: ACCA Manual J load calculations and formal municipal building permits.

Attempting to bypass these steps by hiring an unlicenced contractor who sizes equipment using old-school “rules of thumb” is one of the fastest ways to compromise your property value, spike your energy bills, and break the law. Here is what you need to know about doing the job right.

The Danger of Guessing: What is a Manual J Calculation?

A Manual J calculation is the precise, industry-standard mathematical method used to determine exactly how much heat a structure loses in the dead of winter and gains during a scorching July heatwave.

Many unlicenced or old-school operators still size systems based purely on a home’s square footage (e.g., “every 500 square feet needs one ton of cooling”). This is fundamentally wrong. Two identical 2,000-square-foot homes can have completely different heating and cooling demands.

A proper Manual J calculation evaluates the entire physical structure as a thermodynamic system, inputting variables including:

• Local Climate Data: Using precise design temperatures for Southeastern MA (Climate Zone 5A).

• Insulation Levels: R-values inside walls, attics, foundations, and rim joists.

• Window Performance: The specific U-factor and Solar Heat Gain Coefficient (SHGC) of your glass.

• Structural Orientation: Which direction the house faces and how much solar radiation hits the roof lines.

• Air Infiltration Rates: How tightly sealed the home’s framing structure is.

When you work with a licensed Master Plumber and mechanical specialist, pulling the required municipal permits and performing room-by-room load calculations isn’t an afterthought! It’s the foundation of the entire workflow. It ensures your installation strictly complies with the latest state building laws and maximizes your system’s long-term energy efficiency.

Click here to text us directly at 617-356-7447 to get your system sized accurately by fully licensed local experts, or complete our contact form today!

Yes! Our technicians are regularly dispatched along Route 140 and I-95, allowing us to provide rapid-response AC diagnostics, mini-split maintenance, and cooling repairs directly to households in Sharon