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What's in a Point?
Understanding the EnerGuide Rating System

What EnerGuide rating should I try to reach in my home?

Thatís a very common question, especially since Ontario Building Code is mandating EnerGuide 80 or equivalent for new homes starting January 2012. To answer that, you really have to understand the nature of the EnerGuide scale.

The scale may seem straight-forward - it goes from 0 to 100. A rating of 0 would be a home with excessive air leakage, no insulation and extremely high energy consumption.

Conversely, a home with a 100 rating is airtight (yet efficiently ventilated), very well insulated, and is self-sustaining when it comes to energy consumption.

TYPICAL ENERGY EFFICIENCY RATINGS

TYPE of HOUSE
"E" RATING
New house built to building code standards
65-72
New house with some energy-efficiency improvements
73-79
Energy-efficient new house
80-90
House requiring little or no purchased energy
91-100
Source: Natural Resources Canada, Office of Energy Efficiency (OEE)

 

EnerGuide’s LOGARITHMIC scale understates the value of a high rating

An EnerGuide “point” is deceiving, because the scale is logarithmic. A house with a relatively low EnerGuide rating can vault up the scale with relatively minor energy efficiency upgrades.

Meanwhile, towards the upper end of the scale, there is a very significant difference between a new home built to an EnerGuide 80 rating and one built to EnerGuide 85 or even 90. New homebuyers need to understand that they can benefit considerably by striving for a higher rating. Higher up-front costs are quickly recouped by greater annual energy savings.

8 "POINTS" = 50% ENERGY SAVINGS!

ENERGUIDE RATING
ANNUAL ENERGY USE "POINT VALUE"
81 (Thermapan Solution #1)
28,912 kWh N/A - Baseline
83 (Thermapan Solution #2 & #3)
25,020 kWh 2 points = 13% savings
84 (Thermapan Solution #4)
23,630 kWh 3 points = 18% savings
85 (Thermapan Solution #5) 18,080 kWh 5 points = 37% savings
86 (Thermapan Solution #6)
14,377 kWh 8 points = 50% savings
Source: Natural Resources Canada, Office of Enerrgy Efficiency (OEE)

 

 

 


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