How We Research, Test and Price

  • Costs: we gather quotes or published price data from at least 3 sources per region, state the month, and show a range and a typical figure. We say how many data points sit behind each number.
  • How-tos: every procedure is performed, or reviewed by someone who has performed it, and photographed during the work.
  • Product picks: we state what we tested, for how long, and what we did not test. Affiliate links never change a ranking.
  • Limits: local code, climate and house age change the right answer. Where they do, the page says so and points to the building department.