Practical guide for homeowners hiring contractors: avoid ten costly mistakes, verify licenses/contracts/payments, document work, manage permits and contingencies to protect $50k–$200k renovations.

Hands-on guide to convert 1985–2005 American homes to efficient all-electric comfort using European systems (exterior insulation, radiant floors, air-to-water heat pumps, HRV), real case studies, costs, and tax credit tips.