To quickly unfreeze frozen building water pipes, apply focused heat to the pipe's midpoint using a hairdryer, heat lamp, or hot water bottle. If the pipe is accessible, pour hot water (140°F–160°F) along its length. After thawing, insulate exposed sections with foam rubber or fiberglass sleeves to retain heat and prevent future freezing. Avoid open flames, chemical thawing agents, or excessive force to prevent pipe damage.

Freezing occurs when water inside pipes reaches 32°F (0°C), forming ice that blocks flow. Applying heat generates convection currents, melting ice from the inside outward. Insulation reduces heat loss by up to 90%, as shown by the U.S. Department of Energy, which states that properly insulated pipes in cold climates require 50% less energy for heating. Data from the National Weather Service indicates that pipes freeze when ambient temperatures drop below 20°F (-6°C) for prolonged periods. Repeated freezing cycles weaken pipe materials, with a 2020 study by the American Water Works Association finding that 60% of pipe failures in northern U.S. regions stem from thermal stress. Thawing with hot water is effective but temporary; without insulation, pipes may refreeze within 24 hours. For critical systems, hire licensed plumbers to avoid catastrophic damage. Always prioritize safety by avoiding electrical hazards near thawing pipes.