Using a blower door, a negative pressure differential is created in the house to determine how much outside air infiltrates the house. High infiltration rates affect the amount of energy needed to heat and cool a home as well as the indoor air quality.

In a similar manner to a blower door, a duct blaster can measure leakage in a duct system.

Every building component, including each wall, window, door, ceiling and floor, is measured and recorded to determine the exact amount of heat that is lost or gained. The results can help properly size a heating and cooling system which is essential for comfort and efficiency. In addition, load calculations can help determine how much energy would be saved by making improvements.

Both electricity and gas bills for the last year are collected to determine household energy trends

The insulation in the attic, walls, and crawlspace are examined and measured to determine resistance values and installation quality.

Each light and each appliance in the home is examined and all the pertinent energy information is recorded.

An indoor air quality tool can be left in the home for a week to determine pollutant levels in the house.

Existing heating and cooling systems, including furnaces and air conditioners, are thoughoughly examined to measure their operational efficiency.

The climate conditions, building orientation, and utility bills are all collected to determine the feasibility of renewable solar options.

The building envelope is examined to determine any areas where heat might be lost or gained.

Weather station information and conditions about the building site are collected to determine exactly how much energy is needed to heat or cool the home.

The existing water heating system is examined to determine its efficiency.