Worried about heating costs? This 2-minute HVAC test could cut your costs by 15%

Use this mainly as a quick gut check, not a precise test. “The two‑minute light test is a good go or no‑go check,” says Kerr, ...
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Oil Filter Testing

Some aviation oil filters fall short of efficiency standards, but still protect engines-barely. Understand what yours really does. The post Oil Filter Testing appeared first on KITPLANES.