Manual J/S/D
residential HVAC systems are properly sized, selected, and installed. These
calculations are essential for meeting code requirements, maximizing system
efficiency, and delivering year-round indoor comfort.
What Is Manual J/S/D
At C2S Energy, we provide professional Manual J, S, and D calculations to ensure residential HVAC systems are properly sized, selected, and installed.
These calculations are essential for meeting code requirements, maximizing system efficiency, and delivering year-round indoor comfort.
Why Choose C2S Energy?
Certified HERS Raters
Trained and RESNET-certified for accurate, code-compliant energy ratings.
Local Expertise
We know the regional codes, climate, and programs that affect your project.
Hands-On Support
From start to finish, we guide you through every step. No guesswork, no delays.
What Are Manual
J, S, and D?
Manual J – Heating and Cooling Load Calculations
Manual J determines the heating and cooling load of a home based on climate zone, insulation levels, window types, orientation, building materials, and internal gains.
Manual S – Equipment Selection
Using the results of Manual J, Manual S helps select the correct HVAC equipment—including furnaces, air conditioners, heat pumps, and air handlers—based on capacity, SEER/HSPF ratings, and manufacturer data.
Manual D – Duct Design
Manual D takes it further by designing the ductwork layout and sizing to distribute conditioned air evenly throughout the home. It considers air velocity, static pressure, and friction loss, helping avoid common issues like hot/cold spots, poor airflow, and system inefficiency.
Testimonials
What Our Clients Are Saying
Jane Cooper
C2S Energy is an excellent company with a field supervisor who cares.(“Nelson”) They did an awesome job on my wall.. & the crew actually cleaned up after they were done. My wall …
Kristin Watson
David, Mario and Carlos arrived at our home on time and knew exactly what needed to be completed for our particular job. They were respectful, friendly, and worked every second …
Jacob Jones
I am very happy with David, Carlos and Mario from C2S Energy. David kept me updated as they worked insulting my home. They were punctual, courteous, and hard working …