Retrofitting: Lessons from the Residential Market Paul Francisco Indoor Climate Research & Training Illinois Sustainable Technology Center

What People “Like” Windows Doors Insulation

What is “Easy” Windows Doors Insulation

What is “Hard” Air sealing – where are the leaks? Space conditioning – if you want to use a different technology

Courtesy: Larry Harmon Courtesy: Brian Kumer

Source: Anis et al. 2013. ASHRAE Transactions.

What Works SIR = 𝐹𝑖𝑟𝑠𝑡−𝑦𝑒𝑎𝑟 𝑠𝑎𝑣𝑖𝑛𝑔𝑠 ∗𝑈𝑃𝑊 𝐶𝑜𝑠𝑡 Metric? In low-income weatherization, the metric is Savings-to- Investment Ratio (SIR) SIR = 𝐹𝑖𝑟𝑠𝑡−𝑦𝑒𝑎𝑟 𝑠𝑎𝑣𝑖𝑛𝑔𝑠 ∗𝑈𝑃𝑊 𝐶𝑜𝑠𝑡 Means how many times the measure will pay for itself

What Works Air sealing Insulation Upgrades to high-efficiency space conditioning systems Sealing ducts outside of conditioned space Lighting Refrigeration

What Works Primary goal should be to have the thermal and pressure boundary aligned Air seal first Then insulate Air leakage is like having the windows open

Stack Effect Positive pressure (with reference to outside) 3/31/2017 Positive pressure (with reference to outside) Neutral pressure plane Negative pressure (with reference to outside) Courtesy David Keefe, Vermont Energy Investment Corp. 13 13

What Doesn’t Work Routine weatherstripping and caulking Tune-ups Sealing ducts inside conditioned space Doors Windows

Thank you! QUESTIONS? Paul Francisco 244-0667 pwf@illinois.edu