Comfort
starts
on paper.
Accurate loads. Matched equipment. Ducts designed for the way your home is built.
One connected design, three essential calculations.
Manual J
We calculate the precise heating and cooling needs of your home, room by room.
Manual S
We select the right equipment for comfort, efficiency, and longevity — from real performance data.
Manual D
We design duct systems that move the right air to every room, sized to the calculated load.
For contractors & builders
Deliver better outcomes and fewer callbacks with permit-ready reports you can trust.
- Accurate first time
- Stronger bids & fewer change orders
- Professional reports for every permit
For homeowners
Know what your home actually needs before choosing equipment or accepting a guess.
- Right-sized comfort
- Lower energy costs
- Healthy, quiet, even comfort
Built for the plan set, not the sales pitch.
Upload drawings, specifications, or dimensioned sketches. We model the project in WrightSoft and return clear documentation for equipment selection, duct coordination, and permit submittal.
- Room-by-room load report
- Equipment selection when needed
- Duct layout drawn on your plans
Frequently asked questions
Manual J load calculations are priced at $0.14 per square foot with a $350 minimum. A full design package including Manual J, Manual S equipment selection, and Manual D duct design starts at $990. Add-ons include ERV selection ($25 each), dehumidifier or humidifier integration ($15 each), and ERV duct design ($175 per ERV). Larger or complex projects are scoped individually. See full pricing details.
Floor plans or sketches with dimensions, the project location, window and door details, insulation levels, and any known equipment preferences or permit requirements. We review what you send and confirm what’s needed before work begins.
Yes. We work remotely with homeowners, builders, architects, and HVAC contractors across all 50 states. Plans and project details are reviewed digitally — no site visit required.
The old system may have been sized wrong from the start. And even if it wasn’t, the home may have changed — insulation upgrades, window replacements, additions, air sealing. The only way to know the right size is to calculate it from the home as it stands today.
Manual J calculates the load — what the home needs. Manual S selects equipment whose real published performance at your design conditions matches that load. Manual D designs the duct system to deliver the calculated airflow to each room. The three are a chain: each depends on the one before it.
Most residential projects are completed within 24–48 hours after we receive complete plans and project information. Complex projects or architectural duct layouts may need additional review time — we’ll let you know upfront.
No. An oversized system short-cycles — it satisfies the thermostat quickly, shuts off, and never runs long enough to remove humidity. Rooms feel clammy, components wear faster, and the system often costs more to operate. Bigger is not safer. Accurate is safer.
Manual J is the ACCA standard method for calculating how much heating and cooling a home needs, room by room. It accounts for the home’s actual size, construction, orientation, windows, insulation, infiltration rate, and the local climate. The result is the load — the number every other design decision should be built from.
Online calculators use square footage multipliers and climate generalizations. Manual J uses the actual construction details of the specific home — every wall assembly, window, infiltration rate, and local design temperature. The difference shows up in the rooms that are never comfortable when sizing is done by formula.
Licensed. Certified. Accredited & 30+ Yrs of HVAC Design
Residential load calculations are our primary work — not a sideline service, not an add-on to an installation business. We use WrightSoft with ACCA Manual J, S, and D methodology on every project, the same tools and standards required for permit submittal and equipment selection nationwide. Builders, contractors, architects, and homeowners send us their plans and get back calculations they can actually use — permit-ready, defensible, and sized to the home in front of us, not a square-footage guess.