Step #3:
Once the plans are received and the data verified, the Manual J Load Calculation is performed on the plans – as submitted.
Step #4:
This is the step in which “The Formula” is implemented. After reviewing the Manual J Load Calculation results we are able to determine what size HVAC system is required for the home, and have base-line data on energy costs and duct design. We then set the original load calculation information aside, and begin to change out some of the original materials selected for enhanced materials, and re-run the load calculation repeatedly until we’ve created the very best possible structure, and the most efficient HVAC system for that structure. |
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Here’s a generic example:
Original Design – 2,000 SF conditioned space:
2”x4” stick built exterior walls – R-19
- Truss roof with fiberglass insulation – R-30
- Poured concrete foundation
- Windows & Doors – “Good” quality
HVAC system size required: 5-ton
Projected Operating Cost: $150.00 per month |
Revised Design – 2,000 SF conditioned space:
- 6” ICF exterior walls
- Trussed roof system with blown in insulation
- 8” ICF foundation
- Windows & Doors – “Good” Quality
HVAC system size required: 2-ton
Projected Operating Cost: $45.00 per month |
While this generic sample case reflects only the most basic of changes to the original design, the data output is significant, and applies to the vast majority of residential applications. Notice what happened during the revision process when “The Formula” was implemented:
Changed from stick to ICF for exterior walls
- Changed from truss + fiberglass to blown-in insulation
- Changed from poured foundation to ICF foundation
- Kept windows – “Good” Quality
Results:
- Reduced required system size by: 3-tons
- Reduced Projected Operating Cost by: $105.00 per month
By reassigning the savings captured from the smaller HVAC system and using those monies to offset the additional cost of ICF for this project, the enhanced construction cost has been minimized
- By converting from traditional stick built to ICF the homeowner/homebuilder is able to include the conversion costs into the mortgage which will offer long-term tax advantages that the lesser quality construction type (stick built) would not have provided
Bottom line …
“Fixed Costs” - Vs. - “Unknown Costs”
Fixed Costs = Predictable cost to enhance construction type at today’s prices.
Unknown Costs = Unpredictable, sky-rocketing costs of utilities
Note:
“The Formula” is also effective in light commercial, commercial and industrial applications. However, the data input criteria is dramatically different from that of residential applications, therefore additional information must be included to produce accurate load calculation data – and when applying “The Formula” . |
