HVAC Load Calculator

With EDS you can spend less time staring at a spreadsheet and more time closing your sale.

Our HVAC Load Calculator is the quickest, most contractor and consumer friendly, supremely accurate heat loss/heat gain load calculation software application available.

A Comfort Advisor can perform a whole house block load calculation in under 5 minutes. This is possible be utilizing data from Google Earth, Zillow, and real estate databases along with a complex series of algorithms and equations. The user interface and reports are elegant and streamlined. There are many basic assumptions of factors that are INITIALLY made (and can be done remotely before going to the house), but they do require an in–home verification and truing up in order to arrive at an accurate block load.

This simplistic sales tool can be mastered in minutes and help differentiate you from your competition when utilized appropriately as part of an integrated Buyer Guidance (Sales) Process. This is a critical step in the Buyer Guidance Process that over 80% of all salespeople fail to do. This simple step will help you legally and ethically discredit contractors that size systems based on existing equipment, square footage or unreliable and inaccurate rules of thumb. The process can performed remotely to estimate the load and then trued-up once in the home.

In fact, ACCA, ASHRAE, the EPA and DOE, and even Consumers Reports state that if a contractor verifies the size of equipment by only looking at the existing equipment or measuring only the square footage, that a homeowner should not do business with such a contractor.

Conducting an HVAC load calculation allows the contractor to properly size the equipment and take into consideration any additions or home performance measures and adjust the load and properly assess airflow requirements of the duct system for maximum comfort, efficiency, performance, longevity, and energy savings. If a contractor does not measure and test they are just guessing.

Benefits of HVAC Load Calculator

This is an advanced home energy audits tool, designed for use by professional auditors doing thorough assessments. By drawing data from various online public sources, we help auditors assess a home’s Heat Bleed and create a customized energy profile. Some variances in computed estimates may exist.


You’ll pay more for higher-capacity equipment, so by sizing your equipment correctly by performing a load calculation you can save on the up-front cost


When your equipment is too large for your home it will cause it to short cycle, which can cause temperature and humidity control problems that adversely affect comfort and lead to health issues like mold growth


HVAC equipment that is properly sized heats and cools your living space more efficiently, so you avoid unnecessary energy waste that inflates your operating costs


Short cycling is not only inefficient, it also puts wear and strain on your HVAC components that can shorten their expected lifespan

EDS Home Performance Software

Energy Design Systems (EDS), an industry leader in providing and implementing HVAC engineering and sales systems; and ground-breaking marketing programs for over 20 years. In addition to its customary initiatives, EDS is currently working with manufacturers, distributors, utilities, associations and contractors developing and implementing new programs, which leverage opportunities created by the changing utility and energy industries in North America.

  • Technical support
  • Partnered services
  • Works on all devices
  • CI/CD for latest updates
HVAC Industry Trends & Statistics

Why EDS Home Energy Audits

Free Trial

14 day free trial

24/7 Support

Dedicated experienced support

Money Back

30 days money back guarantee


All updates included

99.9% Uptime

Our fast servers never back down


In app and video tutorials available


Big discounts for bulk users and multi-use clients


Latest technologies and tools


The easiest, fastest and most accurate residential heat loss/heat gain block Load Calculator on the planet.
$150 Year

The Load Calculator is $150/year or $15/month per user. Your user license will automatically renew annually unless cancelled.