Manual J is required to obtain your HVAC permit in MA

Ensure HVAC Sizing Compliance

If you are an HVAC contractor or home energy rater, you know what Manual J is and how important it is for properly sizing an HVAC system. These HVAC guidelines apply to any residential unit that has a HVAC and exhaust system:

  • Single-family detached structures, duplex structures, and triplex structures
  • Single-family attached structures (row house or town house)
  • Dwelling units in multi-family attached structures (condo and apartment units)
  • Energy-efficient homes

Accurately calculating BTUs

Manual J outlines the requirements for conducting a “load calculation” on the home, such as measuring insulation and ventilation levels. Other considerations include air duct tightness and the number of heat-producing appliances and people.

Each room’s results specify how many British thermal units (BTUs) are lost in the winter and how many are gained in the summer.

After measuring each room’s sensible (temperature-related) and latent (humidity-related) heat, the technician can then determine how much conditioned air that room requires. It is necessary to conduct this inspection prior to sizing a system so that you end up with a properly sized HVAC system.

Any & all HVAC systems constructed must undergo the Manual J calculation by order of the Massachusetts building code.

Proficient with ACCA approved software; Wrightsoft Right-J8 our team is more than able to handle any calculation. 

Do you need an inspection?

Get in touch now!

Here is what our customers say about Target Inspections.


"Fantastic Job"

I highly recommend Target Inspections. They have done an absolute fantastic job addressing my concerns, mold testing, and providing recommendations to rectify our issues. Steve is responsive, dedicated, and a true professional.

Jennifer Griffin

"Kind and Professional"

From the moment we contacted Steve it was and has been a pleasure doing business with him, from his prompt responses, his vast knowledge that he shared as he answered our multiple questions, scheduling appointments to meet our time sensitive needs, and his kindness and professionalism that always stands out as he works.

Alexia Levy

"Extremely Helpful"

My experience with Target Home Inspections was wonderful. I highly recommend contacting Steve for your home inspection needs. He was kind, professional, knowledgeable, reliable & overall extremely helpful.

Rachael Gross

Schedule your inspection today

Contact Us

Call Steve and his team in West Dennis, MA to set up your appointment today.


(508) 737-4289


24 School Street; West Dennis, MA 02670

500 characters remaining