Existing Housing Stock. Four Square Revisited Toward Zero Energy Renovation. Getting Bigger as Time Goes On. How Old and New Houses Use Energy

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1 Fur Squar Rvt Twar Zr Ery Rvat Bty Pttt, FAIA Bu S wwwbu Nubr f Hu Ut (thua) bfr 1919 Ext Hu Stk A f US Hu Stk (a ut typ) I N f Ery Rtrft Nw H Bu S Bu S Sur: US Cu Burau, Aua Hu Survy: Hw O a Nw Hu U Ery Tta Btu Cupt pr Huh, 2001 Gtt Br a T G O Avra Hu Sz 1940: ~1100 q ft 1 Avra Hu Sz 1973: 1660 q ft ,000 Avra S Fay H Sz, Btu pr huh Spa Hat Etr Ar Ct Watr Hat Rfrratr Othr Appa a Lht Hu Sz (q ft) 2,500 2,000 1,500 1, Tta bfr Avra Hu Sz 2005: 2434 q ft Bu S Sur: US Cu Burau, Aua Hu Survy: 3 Bu S 1 W, Ax a Ja Bha Sa Bautfu Jura f Iutra Ey, V 9, N EIA, Aua Ery Rvw, 2001 ata: wwwav/u/ar 4 bu 1 f 11

2 Hw a 100 yar hu rw t at a ata 100 yar t $100/q ft Hw a 100 yar hu rw t at a ata 100 yar Bu Eur BEFORE CONDITIONED SQ FT = 2,000 Ar Laka 10 q f aka ara pr 100 q ft f urfa ara Wa Iuat Ltt t Att Iuat R-19 Ww S pa a wth tr ww Mhaa Syt Hat C DHW BEFORE 60% AFUE fr th br -a -vr by raatr 9 EER fr th ww ut 04 EF fr ht watr ffy- AVERAGE ur ffy uh wr wtr ffy wu b abut at 60% ( th br hat th hu aray) Bu Eur AFTER CONDITIONED SQ FT = 3,600 Mhaa Syt AFTER Ct Att R-39 Hh Dty Spray Fa hath Hat Sa but 92% AFUE a br R-21 rf k uat Tta Rf R-60 br t bat Wa R-13 u bw t xt 2x4 wa C 14 SEER pt yt t pa Wa Shath 4 Py R-28 hath Tta Wa R-41 DHW 080 EF -ar tra tak Bat Fr Ur-ab 2 XPS, R-10 Dut R-42 fx ruut rpp r fr jt Bat Wa 4 R-28 HD SPF prtr wa Laka t ut (5% r ) Ww Ar Wwrht Rpat Ww Vtat Fa Cyr Suppy-y yt trat wth AHU Wht Avra U=~033, SHGC=~033 33% Duty Cy: 10 ut ; 20 ut ff Iftrat 20 q aka ara pr 100 f f vp CFM tuu avra fw Bu S 5 Bu S Rtur Pathway Trafr r/jup ut at br 6 La Rut by Crvat > 120 kbtu Th a St Grat Ery Ra La 6520 kwh a 566 Thr Prt Aua La Cpar Bt Ara Supr-Iuat 4 BR Hu Ery Cupt wth Avra US Ua 10^6 Btu/yar Pu, 2950 kwh 22% Appa, 1768 kwh 13% C, 752 kwh 6% Hat, 394 Thr 36% 50 0 Ora Ct, 156% ua Bhark (ba) Ara Bhark, 124 av Prttyp, 458% av 68F/78F, 494% av 35 kw PV, 680% av 70 kw PV, 787% av Lht, 1050 kwh 8% Ht Watr, 172 Thr 15% Bu S Hat C Ht Watr Lht Appa Pu 7 Bu S 8 bu 2 f 11

3 Atua Frt Yar 3200 kwh a 570 Thr $15 /kwh $150/thr Etr $471 Ga $858 Etr/th - $39 Ga/th = $71 Atua Frt Yar 3200 kwh a 570 Thr $15 /kwh $150/thr Etr $471 Ga $858 Etr/th - $39 Ga/th = $71 A Phtvta Th tr u wa abut 300 kwh pr th A 4kW PV yt w rat abut 300 kwh pr th At $4 pr kw th yt wu t $16,000 Th tr b vr 32 yar at th rat wu b $16,000 $16,000 at 56% w t $92 pr th A Sar Ht Watr A 64 q ft y SHW ta wth tra = $6,000 Th wu rat abut 180 thr At $150 pr thr th av wu b $270 pr yar Ovr 22 yar at th rat av wu = $6,000 $6,000 at 56% wu t $35 pr th Bu S 9 Bu S 10 Bu S Bu S bu 3 f 11

4 Fur Squar Rvat Fur Squar Rvat bu Frt fr pa S fr pa Bu S 13 Bu S 14 Fur Squar Rvat Fur Squar Rvat bu S fr pa Bu S S fr pa 15 Bu S bu 16 4 f 11

5 Fur Squar Rvat Fur Squar Rvat bu S fr pa Bu S S fr pa 17 Bu S Fur Squar Rvat 18 Fur Squar Rvat bu Cr t thruh hu Bu S Ar barrr tuty 19 Bu S bu 20 5 f 11

6 Fur Squar Rvat Fur Squar Rvat bu Ar barrr tuty Bu S Ar barrr tuty 21 Bu S Fur Squar Rvat 22 Fur Squar Rvat bu Ar barrr tuty Bu S 23 Bu S bu Draa pa tuty 24 6 f 11

7 Fur Squar Rvat bu Bu S Draa pa tuty 25 Bu S Fur Squar Rvat bu Bu S Draa pa tuty 27 Bu S bu 7 f 11

8 Fur Squar Rvat Fur Squar Rvat bu Bu S Draa pa tuty Thra tuty 29 Bu S Fur Squar Rvat 30 Fur Squar Rvat bu Thra tuty Bu S Thra tuty 31 Bu S bu 32 8 f 11

9 Fur Squar Rvat Fur Squar Rvat bu Thra tuty Bu S 33 Bu S Fur Squar Rvat Vapr barrr tuty 34 Fur Squar Rvat bu Bu S Vapr barrr tuty 35 Bu S bu Vapr barrr tuty 36 9 f 11

10 Fur Squar Rvat Nw Ww bu Bu S Vapr barrr tuty Pht urty f Da Mrr, F Hbu Maaz 37 Bu S Nw Ww 38 Fur Squar Rvat bu Mhaa hat Bu S 39 Bu S bu f 11

11 O Br t Nw Br pu ar har, ut ar tak, ftrat, a xhaut at bath a kth bu Bu S 41 bu bu 11 f 11