HVAC Load
ClaimedSize home HVAC loads, plan room-by-room ducts, and check equipment fit
Free, no paid tier Visit Website Free Visit Website
Tracked since 2026
The Bottom Line
- Best for
- HVAC contractors, installers and service techs, owner-operators of small HVAC shops, estimators and salespeople, and energy or insulation co
- Price
- Free, no paid tier. Compare plans
Not for
It does not replace a certified room by room design.
What is HVAC Load?
HVAC Load sizes heating and cooling systems for US houses. Enter floor area, ZIP code and year built to get heating and cooling BTU/h and tons. See where the load comes from, get CFM and a duct size per room, and check if the unit you plan to quote fits. For a heat pump, see the balance point and backup heat. Make a two page PDF report with your logo. The web app is free, needs no account and works with no signal after the first visit. Estimates in the style of ACCA Manual J, not affiliated with
Available on: Web
Preview
Key Features
- Heating and cooling load in BTU/h and the size in tons
- Load breakdown with a what-if list of fixes and BTU/h saved
- Room by room heat, cool, CFM and round duct size, or ductless head size
- Equipment check for AC, furnace and heat pump, with balance point an
- Fuel use check against last winter's fuel
- Two page PDF report with your logo and client details
- Works with no signal after the first visit, no account, jobs stay on your device
- Climate data for about 1,200 US weather stations by ZIP code or town
Pricing
Free
HVAC Load is completely free to use with no hidden costs.
Reviews
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HVAC Load FAQ
How can HVAC Load assist a contractor in designing a duct system for a new home?
HVAC Load provides room-by-room CFM and duct size calculations, allowing contractors to plan ductwork for each room. It also checks if the planned equipment fits the calculated load, ensuring the system is properly sized.
Does HVAC Load support buildings outside the United States?
No, HVAC Load is designed specifically for sizing heating and cooling systems in US houses. It uses US ZIP codes and construction practices, so it is not suitable for international projects.
Which teams would find HVAC Load most useful?
HVAC contractors, home builders, and energy consultants who need to size residential heating and cooling systems will find HVAC Load useful. It streamlines load calculations and duct planning for US houses.
How is HVAC Load priced?
HVAC Load is completely free to use with no paid plans or subscriptions required. Users can access all features without creating an account.
What information does HVAC Load need to start a load calculation?
To calculate loads, HVAC Load requires the floor area, ZIP code, and year built of the house. It then provides heating and cooling BTU/h and tons.
Can HVAC Load generate a professional report with a company logo?
Yes, HVAC Load can produce a two-page PDF report that includes the user's company logo, making it suitable for client presentations and documentation.
How does HVAC Load handle heat pump system design?
For heat pump systems, HVAC Load displays the balance point and required backup heat, helping contractors ensure the system will perform efficiently in the local climate.
Does HVAC Load require an internet connection to function after the first visit?
No, after the first visit, HVAC Load works without an internet signal, allowing users to continue using the web app offline.
Source: hvacloadcalculator.app