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Decarbonization is most durable when sequence matters. First reduce loads—air sealing, thermal continuity, solar control, and lower LPD/plug gains—so electrified systems are right-sized. Then electrify end uses with efficient heat pumps (air-source or water-source) and heat-recovery for space conditioning and domestic hot water; integrate controls that are DR-capable to respond to grid events. On-site PV offsets a portion of the new electric load; credible off-site renewable contracts (with attribute retirement) address the balance. Skipping envelope and controls forces oversized equipment, higher peaks, and costlier infrastructure. Offsets don’t correct on-site emissions or performance. Upsizing boilers locks in fossil dependence and rising carbon risk. A “reduce-then-electrify” plan improves comfort and resilience, aligns with LEED’s whole-building performance ethos, and creates a clear documentation pathway for energy, DR readiness, and renewable procurement credits.