What is a residential energy audit

A thorough audit covers the building shell or envelope to account for heat loss or gain as well as the energy consuming equipment in or associated with the building. The audit explores the interactions between the building shell, and the heating, cooling and ventilating equipment. Water use an important tart of the assessment so flow rates at sinks and showers are checked as well. The comfort, health and safety of the occupants are major concerns during the audit process, so anything that impacts those areas is assessed as well.

A building simulation program is used to build a model of the facility. This shows where the energy is being used now and what the most promising upgrades are. At this stage the upgrade costs are based on standard industry assumptions. As noted below, specific proposals can also be quickly evaluated once the base model is built.

A report of the findings, with recommended improvements, will be delivered to the owner/occupant of the building in a timely manner. In some cases the auditor will provide follow up services to assess proposals from vendors and/or to inspect and verify installation of energy efficiency measures.

The building shell:

All the parts that separate the inside from the outside are assessed for their ability to resist heat transfer. Determination is made where that boundary should be (This usually pertains to basements and attics) and what improvements should be made. The parts that are usually included are walls, floors, ceilings, doors, windows and miscellany such as attic hatches. A blowerdoor test will be performed to measure the overall leakiness of the building shell. When conditions permit infrared images are made to pinpoint heat loss areas.

HVAC Equipment:

Furnaces, boilers and air conditioners are assessed visually and if necessary with combustion testing equipment. A test to assess the potential for backdrafting of combustion gases is performed. On forced air systems the ducts are inspected visually and are tested for leakage with a duct blaster when appropriate to the system. All nameplate information is noted along with any recent service tags. Domestic hot water systems are included in this assessment.

Ventilation systems are inspected and when possible measured for performance. This is a critical part of assessing the health and safety of the building.

Health and Safety:

Your home should be your sanctuary, not a place that compromises your wellbeing. Throughout the auditing process the health and safety of the buildings occupants are taken into consideration.


The report that I supply to my customers is a narrative specific to their home, not a generic template. Included are either graphs or tables to show potential savings as well as information on the environmental impact that can be achieved.

Every home and every homeowner has a different set of conditions to deal with. I try to understand your priorities, any special circumstances and immediate and long term remodeling plans when making suggestions for your home. All suggested improvements are rated by cost effectiveness and ease of implementation.

Follow up:

Included in the basic fee is the evaluation of up to five contractor proposals within the first year after the initial report is delivered. Optional services include specification writing, contractor training/instruction and post installation verification testing for quality assurance. The most important part of the energy audit is to see that real steps are taken to reduce energy use.

Contact Building Diagnostics

Via email or cell phone 603-568-9404

© 2008 - 2015 Building Diagnostics