Priority Energy, HVAC Design & Testing - Residential, IL

Professional Load Calcs Starting at $400!

With today's energy efficient, airtight homes, mechanical sizing has become more important than ever before. Many people, including heating, ventilation and air conditioning (HVAC) professionals believe bigger is better when it comes to sizing the mechanical system of your home. This is simply not the case anymore: oversized and poorly designed mechanical systems cost you comfort, indoor air quality and money (both in terms of utilities and costly repairs to your home).

Priority Energy has been at the forefront of designing new home enclosures/envelopes and mechanical systems for years. What's more, we have also been the leader when it comes to forensic analysis of comfort and building durability issues in homes and commercial buildings across the United States.
Comfort is something everyone understands, but what do we mean when we say building durability? Simply put, we mean a structure's ability to last for generations. Time and again, we have seen durability severely impacted by poorly designed mechanical systems.

Priority Energy is an industry leader, offering Mechanical Load Sizing services to maximize comfort and indoor air quality.

ACCA Manual J (Whole Home & Room by Room Sizing)

A complete Manual J will provide the total heating and cooling load (necessary for the ACCA Manual S – Equipment Selection) along with room-by-room loads (necessary for an accurate ACCA Manual D – Duct Design), so the installed system’s heating/cooling capacity can be appropriately distributed throughout the home to maximize comfort.  

  • ACCA-approved software is utilized for the Manual J to ensure accuracy. (click here for a list of approved software programs). Priority Energy utilizes the latest version of Wrightsoft Right J8 for all load calculations.

ACCA Manual S (Equipment Selection)

This is the required report for permitting in the State of Illinois under IECC 2015. A total block load created with the ACCA Manual S will provide the designer with the total heat loss for heating, and the total heat gain (latent and sensible) for cooling. With the total heat load/gain, the designer will be able to select the exact furnace, AC/heat pump, and evaporator coil necessary to meet the home’s heating and cooling loads.

ACCA Manual D (Duct Design & Layout)

An ACCA Manual D is a duct diagram from the furnace/air handler to the registers, including all ductwork, connections, and fittings. A duct system designed with ACCA-approved software will ensure a quiet duct system that will extend the life of the HVAC system and decrease comfort complaints from the buyers/homeowners.

Other Resources on Mechanical Sizing

Priority Energy can provide an ACCA Manual J/D/S at competitive rates within 48 hours; email us your plans for a quote today.

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  • I just wanted to send this message to all you and say GREAT JOB!  We had a rough inspection today and passed for the Woodward Ave. house. The inspector told us "if every house I inspected looked like this one I would be out a job".

    Anonymous Builder
  • We were so impressed with the amount of information the Priority Energy technicians gave us during our ENERGY AUDIT.  If you are buying a house, I would strongly recommend having them do an energy audit on it, in addition to your usual home inspection.

  • Thanks for a super intelligent and deep seminar expertly handled by a staff which was a pleasure to be around. Lunch was superbly and subtly handled.

    A.S. Architect
  • I wanted to thank you for all of your extra time and energy during our BPI training over the last few weeks. You really helped put things in perspective. You are an awesome crew and your facility is a valuable resource for students and the community

    BPI Student, L.E.
  • There is much less dust in the house and the monthly gas and electric charges have been reduced by 10 to 15%.....I'm sure I will see greater savings over a twelve month period......thanks again.

    Aeroseal Client, R.N.
  • Just completed my BPI Field exam for my Quality Control Inspector (QCI) certification renewal at Priority Energy.
    Such a convenient and well-set-up training and test center with caring and knowledgeable staff and proctors! Thanks folks!


    P.R., Ottawa, IL
  • It's been cold here for the past few days and I really feel the difference in heating since the building was Aerosealed! My apartment is so much warmer now. Thank you Priority Energy!


    Miruna; Tenant at Country Manor Apartments, Peru, IL
  • Anytime I can be a reference for all the great work on my (new) house, please let me know.  Priority Energy is outstanding at what they do!

    Executive at Medline Industries, IL

Latest News

Aeroseal VOC Compliance Cert
Recent testing by Berkeley Analytical officially concluded that DUCTSEAL, the Aeroseal  sealant used to seal leaky ductwork is compliant for low volatile organic chemical (VOC) emissions.
Blower Door test at CVS Pharmacy in Glen Ellyn, IL
The newly constructed CVS Pharmacy at the corner of Roosevelt Rd and Park Blvd in Glen Ellyn, IL meets Illinois' energy efficiency requirements and is ready for occupancy!  Priority Energy recently completed the mandatory IECC Blower Door test on the 38,000 s.f.