HVAC SYSTEM DESIGN & TRAINING 

by Licensed Engineers

Precision.  Comfort.  Efficiency. 
ENGINEERED FOR THE WAY YOU LIVE

MEET THE ENGINEERS

William Timberlake

Licensed Engineer in NC & VA specializing in residential heating and cooling systems. Bill focuses on proper equipment sizing and duct system design to ensure comfort and code compliance. His detailed inspections and calculations, based on on-site surveys, deliver accurate, standards-based results.

mOLLY TALMADGE

Licensed Mechanical Engineer in NC & VA with a focus on residential HVAC system design. A U.S. Naval Academy graduate and 10-year Navy Civil Engineer Corps veteran, Molly brings precision and code compliance to every project. As a Wrightsoft instructor, she combines field experience with technical training to deliver accurate, standards-based solutions.

ENGINEERED FOR YOUR HOME

 

Verify if the heating and cooling system is the right size needed


 

Why it's best to have the heating & cooling system designed right the first time


 

Requires Manual J, S & D for NEW HOME BUILDS

Requires Manual J & S for EXISITING HOMES

 

Find answers to common questions about humidity, hot/ and cold rooms, air quality, energy bills 

WHAT IS A LOAD CALCULATION?

And why do I need to know?

Determines the heating and cooling needs of a home to ensure proper sizing of HVAC Equipment & Ductwork

load calculation

Manual J - Heating & Cooling Load Calculations

unit sizing

Manual S - Selecting the right size equipment



DUCT DESIGN

Manual D - Designing a correct Duct System that delivers the right air flow to every room

Thoughts from the Engineer...a Blog

Sizing air-conditioning systems has really changed from how it was done 20 - 30 years ago.  Back in the day, ballpark sizing was usually between 400-600 square feet per ton of cooling based on the age of the house.  With the advent of modern homes, tighter thermal envelopes, increased insulation values and low e-glass windows, the only way to acquire an accurate load is to perform a computer-generated load calculation.      READ MORE

North Carolina PE #037107

Virginia PE #0402029260
CALL US @

919-655-5828 
EMAIL US @

BILL.TIMBERLAKE.PE@GMAIL.COM

MOLLY.TALMADGE.PE@GMAIL.COM

SERVING RALEIGH-DURHAM, THE GREATER TRIAD AREA and THE EASTERN COAST OF NC

© Copyright WTTRE 2026
WILLIAM T. TIMBERLAKE RESIDENTIAL ENGINEERING