"Free, online HVAC load calculator allows you to quickly determine the amount of heating and cooling a residential building needs based on its specs and design. The ServiceTitan HVAC Calculator is intuitively designed to help you figure out the recommended equipment capacity for any room or house. The HVAC load calculation shows you the exact amount of BTUs a certain space requires for sufficient heating and cooling. It identifies the square footage of the room to determine the capacity—BTUs per hour—needed to reach the desired indoor temperature."
This calculator makes length, temperature, area, volume, weight and time conversions. The website also has conversion calculators for heat and electricity.
"Customers rely on contractors in the skilled trades to keep mechanical systems operating efficiently in residential homes and commercial businesses. Those service pros, in return, rely on customers to pay them on time for a maintenance, repair or installation job well done. Rather than scribbling a job invoice on a piece of scrap paper and hoping for the best, many contractors choose to automate the invoicing process using software built specifically for the trades. With [this] free Invoice Generator Tool, techs can create an invoice from the field, save and email it from a mobile device, and reduce hassle."
This website has several HVAC Calculators such as CFM, CVA, PIE, Square Foot calculators, Heat Removal calculator, AC Temp Drop Calculator, and many more.
HVAC Theory Curriculum and Class Standardization
This program of study presents the concepts of heating and air conditioning including air and refrigerant distribution systems. Upon successful completion, participants are prepared to take the HEAT exam, a nationally recognized certification in basic heating, electrical and air conditioning technology.
Shop Measurement and Calculations by Robert Fergesen, HACC, Central Pennsylvania's Community College
Publication Date: updated 2021. Teaches students the basics of the measurement systems that are required for a variety of trades. This course focuses on such measuring systems as: tape measure usage, rulers, micrometers, calipers and a variety of electronic tools. In addition, this course covers basics of unit-of-measure conversions and the use of formulas and lookup tables for a variety shop calculations.
Air Conditioning, Heating, and Refrigeration News
HVAC Glossary of Terms | The HVAC Source
HVAC Glossary of Terms
Free online access to the NEC® and other electrical standards
NFPA 70®, National Electrical Code® (NEC®), sets the foundation for electrical safety in residential, commercial, and industrial occupancies around the world. It is consistently reviewed and updated, with input from active professionals in the field, to stay ahead of the constant changes in technology and safety that affect your job daily.
Engineering ToolBox: Refrigeration Formulas
HVAC Air / Refrigerant Diagnostic Quick Sheet