You're viewing our online Q&As related to Residential HVACR. Other technical categories include Commercial HVACR and General HVACR. You can also browse our complete list of technical Q&As, and ask a question of your own.

Q&As Related to Residential HVACR

Federal Regs on Upgrading Older HVAC Systems
Mismatched heat pumps and upgrading older model HVAC systems. Read it.

J8 Fireplace
The fireplace calculation in Manual J 8th edition explained. Read it.

# on my J Speedsheet
Common user problems with the J speedsheet Read it.

Thermal Mass
Calculating thermal mass in a Manual J procedure. Read it.

Sensible Heat Ratio (SHR)
The default sensible heat ratio is not always the right one. Read it.

What load calculation software should I purchase?
Find the tool you need to use all of the Manual J8 applications. Read it.

Manual J for Replacements
Q&A for Consumers: explains the importance of Manual J heating and cooling load calculations. Read it.

Bypass Duct Design
It's time to update your bypass duct designs. Here's guidance on variable air volume (VAV) duct designs. Read it.

Flex Duct Friction Loss Calculations
How to calculate friction loss on already installed flex systems. Read it.

High Duct Static Pressure Found
What to check and do when the duct static pressure is running higher than the design value. Read it.

A1/A2, and Slope in Manual D Group 12 Transitions
An explanation of terms used in Manual D fittings Read it.

Just Say No to Pan Joists
Use of pan joists for return ducts is not recommended. Read it.

Temperature Difference Between Rooms
Temperature differences between rooms in a dwelling. Read it.

Commercial Kitchen Hoods in a Home
Design considerations for the level of exhaust ventilation must be addressed. Read it.

Shutting Off Unsafe Equipment
Shutting off unsafe equipment and the legal issues that arise. Read it.

Matching SEER Requirements
Matching SEER requirements when replacing indoor/outdoor equipment. Read it.

One System, Multiple Zone Levels
Requirements when two zone levels are being supplied by one system. Read it.

Kitchen Hood Considerations
Design considerations to be taken to overcome different levels of ventilation. Read it.

Fireplaces and Manual J
Fireplaces have considerable impact on heating, but not mch on cooling. Read it.

True Duct Design
Even with a true duct design, technicians must concern themselves with the return side of the system. Read it.

Troubleshooting Mold
A member asks for help diagnosing a mold issue on three registers of a 16-register system. Read it.

You're viewing our online Q&As related to Residential HVACR. Other technical categories include Commercial HVACR and General HVACR. You can also browse our complete list of technical Q&As, and ask a question of your own.