Technical Literature

There's a lot a good service tech needs to keep up with. New SEER ratings, changing refrigerants, charging and diagnostic methods. We're here to help!

Informational Links

Stay on top of your HVAC game with our currated list of industry info.

Hardi Tech Tips

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01 - Simple Rules To Follow on the Placement of Returns 02 - How to Size Residential Ventilation Ducts 03 - Good Rules to Follow When Installing Field Charged Cooling Units 04 - Insulation a new look at an Old Friend 05 - 25 Common Heating Complaints 06 - Sizing Humidifiers by the Book 07 - After the Sale Instructions 08 - Using Tables Doesn't Have to be a Guessing Game 09 - Estimating Energy Usage 10 - The Differences Between Equivalent Length and Effective Length 11 - Safety Tips for Handling Refrigerants 12 - Selecting thru the Door Return Air Grills 13 - Control Terminology: A Glossary of Terms 14 - Dirt Streaking 15 - A Heat Pump Really Saves Energy 16 - Troubleshooting Heat Pumps 17 - A Good Way to Size a Heat Pump 18 - Large Roof Overhang: A Neglected Energy Saver 19 - How to Figure the Desity of Air 20 - Heat Pump Aplication Tips 21 - Going Metric in Heating and Cooling 22 - Night Air Cooling 23 - Heat Pump Installation Checklist 24 - Extended Plenum Problems 25 - Power Outage and Heating and Cooling Equipment 26 - The People Load 27 - Refrigerant Cylinder Storage in Service Vehicles 28 - 13 Seer and the TEV 29 - How Humidity Affects Oders 30 - U Values: a Closer Look at a Basic Tool 31 - Filter Selection 32 - Comparing Fuel on the Basis of Cost 33 - Customer Relations for the Service Tech 34 - How to Predict Furnace Capacity 35 - Building Systems Survey Forms 36 - Potential Explosion 37 - Solving Series and Parallel Circuits 38 - More on Independence 39 - Grounding Promotes Safety 40 - Electrical Safety Precautions 41 - How to Calculate Air Temp in Unconditioned Spaces 42 - How to Properly Size Box Plenums 43 - Total Pressure Equals SP Plus VP 44 - Estimating Annual Operating Cost 45 - Condensing Furnace Installation Notes 46 - Testing for Unsafe Heat Exchangers 47 - Determinig Equivalent Round vs. Rectangle Ducts 48 - Understanding Multi-Leaf Dampers 49 - Working with the New Hydronic Heat Loss Short Form 50 - A Crash Course in Fractions 51 - Refrigerants and their Numbers 52 - Determinig Water Flow Rates in 2 Pipe Circuits 53 - The Why Behind Piping Practices 54 - Finding Relative Humidity Using a Nomograph 55 - The Rungs of the Ladder 56 - More on Ladder Diagrams 57 - Tools to Service HVAC Electronics 58 - New Manual J HTM's for Steel Studs 59 - Heat Loss through Cold Partitions 60 - Ordinances, Codes and Standards 61 - Why 400 CFM Per Ton 62 - A Review of Basic Electrical Relationships 63 - Refrigerant Retrofit Resources 64 - Beware of Faulty Water Heaters and Boilers 65 - Using an "ERIP" Chart to Solve Electrical Circuits