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.

  • Thank you again and you will be the first person I call if I need additional part or service from your company.
  • 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
  • I have a two story home built in the mid seventies. Lots of temperature fluctuation between the floors. The Aeroseal process dramatically increased the air flow to the second floor. Good experience. The company was very informative, answered a lot of questions.

    Vince from Oakbrook, IL
  • "It's been cold here for the past few days and I really feel the difference in heating since the Aeroseal, my apartment is so much warmer now. Thank you!"  

    MP from Peru, IL
  • Thank You so much for the super-fast turn around of our Manual J, D and S reprt for the Village of Glen Ellyn. Our original Manual J kept getting kicked back to us for corrections but your calculations/report got approved instantly-no questions asked and no more permit delays!

    Kim, Glen Ellyn, IL
  • Thank you. Truly. I appreciate you taking the time to clarify things for me and then going above and beyond to ensure that my CEUs are handled for our current RESNET cycle. You’ve always been kind to me and this is another shining example of that.

    Craig, HERS Rater, Batavia, IL
  • (Aeroseal) is a GREAT Product! Really made our townhouse more comfortable!

    Gordon; Chicago, IL
  • We are having less ice on roof since the Aeroseal duct sealing! Thanks!

    Bill; Downers Grove, IL
  • Duct sealing (with Aeroseal) was the smartest thing I ever did! Our home is sooooo much more comfortable! We were so very pleased with Priority Energy and their technicians!

    Richard; Lake Forest, IL
  • On to the Radon issue - Excellent results with Aeroseal!  From 5 + to a .4.  Before sealing like we discussed, I had warm air coming out of the sump basket with the furnace running. Even with the furnace running, it is still pulling air in now.

    Bill; Belvidere, IL
  • Pat was awesome and super helpful! We are experiencing weak air flow in the duct system of our 1950''s home and Pat gave us great recommendations to fix the problem when we do our remodel.

    David; Arlington Heights, IL

Latest News

Photo of Firehouse in DuPage County, IL
A DuPage County Fire House Lieutenant recently called Priority Energy to solve an on-going humidity and comfort problem in their 20-year-old station building.
Energy Star Logo
National news outlets recently reported that the EPA's Energy Star program recommended "new drastic temperature settings" for home thermostats. We searched the internet and could not find a credible source for this information and so turned to Energy Star directly, for more information.