Oklahoma · 838 cities and towns

HVAC Sizing Calculation in Oklahoma for $100.

HVAC sizing for homes in Oklahoma done properly: Manual J loads plus Manual S equipment selection instead of a rule of thumb. J, S and D together for $100.

  • J + S + D for $100
  • Permit-ready PDF
  • 2–3 business days
  • No subscription
Wood-framed new home under construction
Manual J + S + D · $100 per house

Free quote confirmation, no account needed. You pay per house, no subscription.

Climate zones in Oklahoma

Oklahoma spans 2 climate zones.

Design conditions change across the state, so the same house plan can need different equipment in different cities. Places by IECC climate zone (county assignment):

  • Zone 3A · 818 places
  • Zone 4B · 20 places
Pricing

J, S & D for $100 in Oklahoma. All three.

One price for every builder and every contractor, from the first house. No subscription, no software license, no minimum order.

Full permit set

Manual J + S + D

$100 / house

All three reports for one house, matched to each other, in one PDF package.

Order for $100
Load calculation

Manual J

✓ included

Room-by-room heating and cooling loads (sensible and latent) to ACCA Manual J 8th Edition.

Equipment selection

Manual S

✓ included

Checks the furnace, heat pump or AC you plan against the Manual J loads and manufacturer data.

Duct design

Manual D

✓ included

Duct sizing per room: airflow (CFM), supply and return sizes, friction rate and static pressure.

$100 per dwelling unit for all three reports, also if you need only one of them. Confirmed before we start. Unusual projects (very large custom homes, more than two systems) are quoted first.

What you get

A report your plan reviewer recognizes.

Every report is built from your actual plans and the design conditions for Oklahoma, and delivered as one PDF you can upload with the permit application.

Room by roomHeating, sensible and latent cooling load and airflow for every room.
Code referencesPrepared to ACCA Manual J 8th Edition, Manual S and Manual D.
Matched equipmentManual S check against manufacturer data for the unit you plan.
Duct sizesManual D supply and return sizes, friction rate and static pressure.

Example screen with sample numbers (heating / cooling Btu/h per room). Your report uses your plans.

Largest cities

HVAC Sizing Calculation in the biggest cities of Oklahoma.

All cities and towns

Every place in Oklahoma.

Built for the trade

For builders and HVAC contractors in Oklahoma.

We work as your back office for load calculations: you build and install, we deliver the numbers and the paperwork.

Row of new homes in a growing subdivision

Home builders & developers

  • Manual J, S and D with every permit set
  • Same $100 price for one house or a whole subdivision
  • Repeat plans: we keep your models on file
  • One contact for all your projects
New two-story home nearly finished on a construction site

HVAC contractors

  • Size equipment right and win the bid on facts
  • Load calc for replacement permits and rebates
  • Manual D before the duct crew starts
  • No software license, pay only when you have a job

Partner program

FAQ

HVAC Sizing Calculation in Oklahoma, answered.

Can I size HVAC with an online calculator?

Online calculators give a rough range from floor area and climate. They are fine for a first guess, but a permit usually needs a Manual J based on the actual plans, and the equipment choice needs Manual S.

How much does a Manual J cost?

$100 per house for Manual J, Manual S and Manual D together. No subscription and no minimum order.

How fast do I get the report?

Usually 2–3 business days after we receive complete plans and specs.

Will the building department accept it?

Reports follow ACCA Manual J 8th Edition, Manual S and Manual D and use the plans you send. Acceptance is up to your building department; if plan review asks for corrections to our report, we revise it at no charge.

Do you work with builders and contractors on many houses?

Yes. Builders and HVAC contractors are our main customers. The price stays $100 per house for J, S and D, and repeat plans are kept on file.

What do I need to send?

Floor plans, elevations or orientation, the window and door schedule, insulation levels, duct location and the equipment you plan to install.

Sunny suburban street with new homes

Your next permit, sized right.

Manual J, S and D together for $100 in Oklahoma. Send the plans today.

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