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Third-party energy efficiency programs will have their own structure for envelope performance, mechanicals and potential for renewables. Air tightness is an important part of the plan.

All targets are based on ACH measurement at 50 pascals pressure.

Program	Attached ACH	Detached ACH
	3.0	2.5
	1.5	1.5
	1.5	1.0
	0.6	0.6

Note: these targets are based on NEW construction, and so would involve an energy model that prescribes a target.

For renovation and retrofit, blower door testing can establish a baseline ACH.

Older buildings may have as much as 10 - 15 air changes per hour, so improving upon the airtightness can almost be guaranteed by a good renovation plan.