HVAC load calculations, duct designs and permit documents from ACCA-trained designers, for contractors, builders and architects in all 50 states. Family-owned, US-based, and quick to answer the phone.
NewFill out the project questionnaire online
A competitor bid 25 tons of cooling.
The load calculation said 9.
That is the difference between a guess and a Manual J.
From a Google review by Donovan D., a repeat client: “They have also kept us from over sizing equipment in every case.”Free tool
Four quick steps about the house. A designer reviews it and contacts you with accurate estimates.
What we do
From a single Manual J to a full mechanical permit package, done by ACCA-trained designers who answer their own phone.
Residential heating and cooling loads
Right-sized equipment, on paper first
Every room gets the air it needs
Light-commercial load calculations
Included with every Manual D
Variable refrigerant flow, zone by zone
Energy code compliance for your permit
The whole mechanical package
Manual Q, Equipment schedules, Consultation, Makeup air, Design drafting.
How it works
No software to learn and no portal to fight. Email and a phone number that gets answered.
A dimensioned floor plan is enough to start. Elevations and wall sections help. No plans? A sketch and photos work.
Send us your questionnaire and plans, and we’ll get you an estimate right away. New projects typically start within 3–5 business days.
ACCA-trained designers run the calculations and ask questions when something on the plans does not add up.
You receive clear, permit-ready reports by email. If the reviewer has questions, we answer them.
What you receive
Clean, complete and formatted for review. Your installer gets numbers they can build to.
Who we serve
Most of our work comes from contractors and builders who send us plans every month.
We had a new residential build about 3900 sq’. We called several places and nobody got back to us. Our first call to them they picked up, I explained the situation, they sent me the questionnaire and were quick to help us walk through the entire form patiently. Once we had all the info filled out they had the Manual J back to us within a day.
I was in a bind and contacted LoadCalcs.net on Saturday to complete HVAC load calculations that I needed on Monday morning for a project in Washington DC. They did a wonderful job and worked through the tough DC guidelines.
Fast response time and easy to work with. Reports are professional and our building inspector issued our permits shortly after receiving the reports.
LoadCalcs did great on load calculation for us. They selected ERV, Dehumidifier and HVAC equipment and designed the duct system. Great service!
This is an outstanding company to work with. We have several Manual J, D, S done by this company on a monthly basis. Always responsive and hit deadlines. Not to mention their work is top shelf. I will use them for all my future load needs.
We have been working with LoadCalcs for few years now. We build custom homes and LoadCalcs does all our HVAC plans & ResChecks. We've never had any issues with their plans. Our HVAC contractors love their plans as it has all the details…
I can’t say enough kind words about Scott and Amy. The level of service and professionalism deserves 10 stars!! I would definitely recommend this company to everyone!!!
Scott did an excellent job doing a Manual J for my home. He was flexible with my custom home and requirements. I also felt like he took extra time to communicate and clarify anything that I had questions about. I consider this company an excellent value.
I needed manuals done asap. They were great. Took real concerns for my situation. Got me what I needed in 24 hours. Finally a great experience.
The whole team at LoadCalcs are a great balance of knowledgeable, professional and provide an overall great value. Their extensive initial questions and follow through provides the HVAC technician great equipment information, efficient installation designs, which provides the end users a very well balanced tempered home.
I cannot say enough wonderful things about this company! I live in Tennessee and have been working with LoadCalcs from a distance. My parents have been experiencing significant issues with the HVAC system installed in their new construction…
Scott, Jake and Amy are quick to respond and honestly help the "little guy" navigate the world of Manuals. They stick to their word as best they can on expected completion of timeframes. They're my companies go to for both of our builders work.
We here at TRG HVAC LLC have been using LoadCalcs for years now. Scott, Jake and Amy are absolute professionals. The turn around time for results are impeccable. I highly recommend the services offered by Loadcalcs! Thank you again for your help.
Prompt, thorough Manual J calculations from our architect's plans. I'd tried complex calculations with online spreadsheets but had no confidence in my results. Very timely follow-up. All for reasonable fee.
Areas served
We are fully remote, so your jurisdiction matters more than your zip code. We size to the design weather and code where you are building.
Dotted lines show where we’ve delivered. The outline marks home base in Kentucky.
The team
Reviews mention Scott, Jake and Amy by name. That is not an accident.
Principal/Lead Designer · LinkedIn
With over 25 years of experience in the engineering field, Scott started LoadCalcs in 2017 to bring his expertise and passion to the world. ACCA-trained, Scott is dedicated to providing accurate and reliable load calculations for HVAC systems.
Team Lead
A rising star in the design world, and a valuable member of the LoadCalcs team. Joining us in 2021, Jake has quickly made a name for himself with his ACCA training and years of experience in the industry.
Designer (part-time)
Office Coordinator
Amy is the backbone of the LoadCalcs team. Handling all incoming phone calls and responding to emails, Amy keeps the wheels turning and ensures smooth communication with clients.
FAQ
For a replacement, a Manual J makes sure the new system is sized properly, and Manual S matches the equipment to it. On any new system we recommend Manual D so every room gets the air it needs. Energy calculation requirements vary by state and county, and we will help you determine yours.
Our project questionnaire and any construction documents you have: a dimensioned floor plan, elevations, wall sections and electrical plans. No drawings? A sketch with room-by-room dimensions, square footage and window sizes works. Reusing existing equipment? Send photos of both nameplates. If you are unsure of a value, leave it blank and your designer will go over it with you.
New projects typically start within 3–5 business days. Need it faster? 24-hour expedite is available once we have your plans and questionnaire. Reach out during office hours and you’ll hear back within 30 minutes, whether it’s an email, text or call.
Every project is different, so we quote each one. Send us your questionnaire and plans, and we’ll get you an estimate right away.
Yes. Our designers are ACCA-trained, and calculations follow ACCA Manuals J, S, D, N and T.
Wrightsoft for Manuals J, S, D, N and T, REScheck for energy calculations, EnergyGauge for the Florida energy code, Mitsubishi Diamond System Builder for VRF design, and AutoCAD for drafting.
Fast estimates
Send us your questionnaire and plans, and we’ll get you an estimate right away. Reach out during office hours and you’ll hear back within 30 minutes, whether it’s an email, text or call.
