Home Energy Evaluations — MyHEAT

Case Studies

See how we've helped partners boost energy efficiency programs and achieve significant savings.

Validating HEAT Maps through in-person Home Energy Audits

The Challenge

"How do MyHEAT Heat Loss Maps correlate to energy loss observed in-homes from detailed home energy audits?" This is the question MyHEAT wanted to answer to validate and ground-truth energy loss observed with aerial thermal infrared mapping conducted for Calgary, Alberta in 2016.

The Approach

4 Elements, a sustainable building design and consulting firm conducted detailed energy efficiency evaluations of five homes in Calgary, Alberta. Each of these homes were of different sizes, ages and levels of energy efficiency.

Before starting the energy audits, MyHEAT provided detailed Heat Loss imagery for each home to Tyler Hermanson, owner of 4 Elements. Armed with this imagery, Tyler completed energy audits using a combination of blower door tests and thermal infrared (IR) scans of the interior of each home.

"The MyHEAT images provided helpful information and contributed a 'bird's eye view' to assist in the review of the home's energy efficiency. This provided important value to me as a Thermographer and Energy Advisor in providing as much accurate information as possible to the homeowner." - Tyler Hermanson, 4 Elements.

The following examples highlight the correlation between "hotspots" detected in MyHEAT's Heat Loss imagery and the in-home energy audit and handheld infrared images.

The Results

In each home, a detailed Heat Loss image was reviewed while on-site. When comparing these images with the findings of the in-home audits, 4 Elements reported these findings:

  1. Overall, the MyHEAT imagery supported and reinforced findings based on the blower door testing, thermography and the investigator's own knowledge of construction over various ages of homes.
  2. In all cases, the investigation revealed potential thermal and air tightness issues such as poorly sealed attic hatches, plumbing stacks and mechanical chases, which all appeared to match areas of high heat loss on each HEAT map.
  3. In the least upgraded homes, there was a stronger relationship between the findings of the evaluation and major indicators from the MyHEAT image.
  4. The HEAT Map provided the most relevant information on the least efficient homes.

“After working with the MyHEAT images in detail while reviewing these existing homes, it is clear that the images provide real and relevant information in understanding the performance and energy efficiency opportunities of existing homes.” - Tyler Hermanson, 4 Elements.

Exhibits

Heat Loss Map
Attic Hatch IR Image

Chimney

Attic Hatch IR Image

Entry Way

Attic Hatch IR Image

Sun Room

Exhibit A

1959 Bungalow with Attached Garage
  1. Chimney: Openings for flue and combustion air creates a very large area of thermal loss, both through thermal bridging in areas with no insulation and air leakage. This is suspected to be a large area of energy loss.
  2. Entry Way: Change in thermal pattern after applying testing pressure showed potential connection between house and garage.
  3. Heated Sunroom: Although not included in the Heat Loss Map, this area is all glass and includes an older patio door that showed strong leakage at weather-stripping during testing. Moreover, the connection of sunroom framing to the house appears to not be fully airtight.
Heat Loss Map
Attic Hatch IR Image

Attic Hatch

Garage Wall IR Image

Garage Wall

Exhibit B

2011 2 Storey with Attached Garage
  1. Attic Hatch: Large leakage area noted around the attic hatch and the trim that surrounds it. This would allow large amounts of warm humid air to pass during the winter, which can lead to dampness that promotes mould growth as suspected on the insulation blocking around the opening.
  2. Garage Wall: Suspected poorly sealed connection between wall and floors that separate the house from the garage. This would result in additional energy loss and risk of durability issues.
Heat Loss Map
Attic Hatch IR Image

Garage Wall

Attic Hatch IR Image

B-Vent

Attic Hatch IR Image

Fireplace

Attic Hatch IR Image

Living Room

Exhibit C

1976 2 Storey with Attached Garage
  1. Garage Wall: Wall between the house and the garage is showing areas of air leakage. Under normal conditions, this warm air will travel up the plumbing and electrical penetrations, laundry vent and into the garage attic.
  2. Fireplace: Replacement gas insert showing strong leakage around the edge—indicating poor seal of new unit to the existing chimney. Combined with warm house air leaking up the chimney, this creates a greater level of heat loss.
  3. Mechanical Vent: Metal B-vent is unsealed and strongly leaking. Warm house air will rise up this chase wall, which is unsealed at the attic level. Plastic side venting furnace vents also appear to be unsealed.
  4. Living Room: Poorly fit insulation and heavy thermal bridging creates a cold area along the living/dining room ceiling. This area shows suspected air leakage after testing the air pressure applied.

Note: HEAT Maps show red as hot, and blue as cold. The handheld IR images show white and yellow as hot, and purple and blue as cold.

Conclusion

In the individual case studies for each home, MyHEAT’s Heat Loss Maps provided helpful information. They showed a vantage point not available from the ground for thermography and contributed a “bird’s eye-view” to assist in the review of the home energy efficiency. This adds important value for Thermographers and Energy Advisors in providing an accurate energy efficiency evaluation (as possible) to the homeowner.

Through the energy efficiency evaluations of these homes, a wide range of performance was assessed. The Heat Loss Maps supported and reinforced findings based on the blower door testing, thermography and the energy advisor’s own knowledge of construction over various ages of homes. Even the most efficient home of the sample benefited from the review in finding construction weaknesses that were allowing higher than acceptable humidity to accumulate in the attic. Clearly the older, least upgraded homes have the most opportunity for energy savings. As attic insulation is typically one of the first upgrades made on older homes, an understanding of the attic insulation provides a key indicator of the overall efficiency of the home. In the least upgraded homes, there was stronger relationship between the findings of the evaluation and major indicators from Heat Loss Maps.

Energy audits for these homes were conducted by 4 Elements Integrated Design.

Want to learn more? Get in touch with MyHEAT.

Additional Resources


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Read this Tools of Change case study exploring the results of a pilot that measured energy consumers’ behavioural response to MyHEAT imagery.
Nudge customers to action

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Behavioural Nudging: Enhance Engagement


The power of heat loss data can be used to drive energy efficiency program participation by nudging customers to take action.
Potential for customer savings

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Energy Efficiency Potential: Capture More Savings


A study where we found that each unit of improvement in a HEAT Rating corresponds to a 3-5% reduction in natural gas and 1-1.5% reduction in electricity consumption.

Energy Made Visible™

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