HVAC Quick Reference Card — PT Chart, Superheat & Subcooling
- PT chart for R-410A, R-22, R-32, R-454B and R-134a
- Superheat and subcooling formulas and steps on the back
- Laminated, double-sided, wipes clean
Email infohvacresource@gmail.com and a real person will answer within one business day.
How it works
Delivery takes 5 to 15 business days to the United States, Canada, the United Kingdom, Australia and New Zealand. Shipping is calculated at checkout, and you get a tracking number by email as soon as your parcel moves.
What's inside
A laminated double-sided reference card for the truck or the tool bag. One side has a pressure–temperature chart for common refrigerants (R-410A, R-22, R-32, R-454B, R-134a). The other side has target superheat and subcooling tables, the temperature split rule of thumb, and charging procedure checklists for fixed-orifice and TXV systems.
- Laminated, double-sided, 8.5 × 11 in
- PT chart: R-410A, R-22, R-32, R-454B, R-134a
- Target superheat table (fixed-orifice)
- Target subcooling range (TXV)
- Temperature split reference
- Charging procedure checklists
Wipes clean. Fits in a clipboard or tool bag.
Shipping and returns
If something is not right, request a return within 3 days of receiving your order. Items must be unused and in their original packaging. Approved refunds go back to your original payment method within 10 business days.
If your parcel arrives damaged or never arrives, email us within 7 days of the delivery date and we will sort it out.
Full details: Shipping Policy and Refund Policy.
Why knowing the reason matters
Americans die each year from unintentional carbon monoxide poisoning not linked to fires.
Source: CDCHow much less energy an air conditioner can use when its filter is routinely replaced or cleaned.
Source: U.S. Department of EnergyFor refrigerant in new US home AC and heat pump systems made or imported since January 1, 2025.
Source: U.S. EPAFrequently asked questions
Who is this for?
Apprentices, students and working HVAC/R technicians who want to understand the reason behind the readings they take, not just memorize the numbers.
How long does delivery take?
Delivery takes 5 to 15 business days to the United States, Canada, the United Kingdom, Australia and New Zealand. Shipping is calculated at checkout, and you get a tracking number by email.
What is your return policy?
You can request a return within 3 days of receiving your order. Items must be unused and in their original packaging. Approved refunds go back to your original payment method within 10 business days. See the full Refund Policy.
Do you have Spanish editions?
Yes. The Fundamentals Handbook comes in Spanish as a paperback, an eBook and a workbook, and the Inverter Mini Split guide comes in Spanish as a paperback. See the full catalog.
Can I order for my crew or class?
Yes. Choose Buy 2 or Buy 3 at the top of the page, or email infohvacresource@gmail.com for a larger order.
Does this replace local code or manufacturer instructions?
No. Our materials are for education and exam preparation. Always follow the codes that apply where you work and the manufacturer's instructions for the equipment you service.
Who do I contact with a question?
Email infohvacresource@gmail.com and a real person will answer within one business day.