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  A2L Superheat & Subcooling Calculator

  $8.95 – $79.50Price range: $8.95 through $79.50
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  Duct Sizing Calculator

  $9.95 – $89.50Price range: $9.95 through $89.50
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  R-22 Superheat & Subcooling Calculator

  $8.95 – $79.50Price range: $8.95 through $79.50
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  R-410a Superheat & Subcooling Calculator

  $8.95 – $79.50Price range: $8.95 through $79.50
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  Refrigeration Calculator Guide to Back and Head Pressure

  $10.95 – $99.50Price range: $10.95 through $99.50
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  Troubleshooting Calculator for Air Conditioning and Refrigeration Systems

  $10.95 – $99.50Price range: $10.95 through $99.50
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  Troubleshooting Guide for Gas Induced Draft Furnaces

  $10.95 – $99.50Price range: $10.95 through $99.50