【正文】 er non intervention houses ?Met goal of “do no harm” – did not adversely influence the houses when tightening them ?In these houses, mechanical ventilation did not solve the indoor air pollution problem Phase 2 Ventilation ?More precise Air changes per hour Active sampling of formaldehyde ?Measure tight houses with and without outdoor air (no air cyclers) ?Measure tight houses with air cyclers ?Measure leakier houses without air cyclers ?Change Intervention Configuration Mechanical dehumidification (50% RH) More affordable closed crawl configuration ?Measure More Precisely pollutants air changes per hour Does filtration change anything? Next Steps Get what works to market ?MarketReady Specs “Prescription” for a dry house 919 8579000 [phone] 919 8322696 [fax] 909 Capability Drive, Suite 2100 Raleigh, NC 276063870 ?Following are additional slides with supplementary information that will be discussed further in final report and articles 7 Steps to highperformance housing ?Standards ?Plan Review ?Contractor/Subcontractor training ?Onsite quality control ?Performance testing ?Certification/Guarantee ?Servicing the Guarantee TOTAL INTERVENTION COST* Upgrade Study cost per house [2020] Materials amp。 frame] $200$800 [installation] Same Total per house $6,145 $4,540 *Based on 1200 square foot house at lowest estimate SYSTEMVISION UPGRADE ESTIMATES* Standard Upgrade Study estimate per home [2020] Market estimate per home [2020] 1 Proper blocking and building air tightness $75 $100 2 Wholehouse mechanical ventilation $200 $100 Bath and kitchen exhaust upgrades $300 $300 3 Proper insulation installation $300 $150 Attic insulation increase to R38 $100 Raised heel trusses $250 $250 LowE windows $150 $150 4 Outdoor thermostat[s] on heat pump[s] $100 14 SEER heat pump $600 90% Efficient furnace with 13 SEER air conditioner $400 Proper duct sealing $100 $100 5 Pressure balance and relief $150 $150 6 Electric or gas water heater efficiency upgrade $100 $100 7 Carbon Monoxide detector if applicable $20 Total Electric package total [per home] $1,725 $2,100 Gas package total [per home] $1,725 $1,920 ENERGY PERFORMANCE MEASUREMENT House Type Number in Group Number Submetered NonIntervention w/ Retrofit 7 7 NonIntervention 7 7* Intervention 16 8 Number of homes