Every Building Has a Unique DNA
Did you know that two identical homes or buildings in the same exact area can have very different characteristics? In fact, even if they were built at the same time with the same specifications, you could say each building has the equivalent of its own DNA.
The most obvious causes include orientation of the building, natural shading, etc. Other differences include more subtle, yet significant changes that occur both during construction and once occupied. Here are some less apparent factors that can contribute to a building’s unique DNA:
Building Construction Variations
While the same components may be used on two identical structures, each building’s characteristics can be changed by how those components are installed.
For example, is the insulation in walls and unconditioned spaces installed properly? Are there gaps and voids in the insulation and sheathing? Was it over-compressed in some cavities? Was blown in insulation applied at a consistent height? Were all penetrations sealed properly?
Then add in variables including skill differences from crew to crew, how late they were on completing the job, uncomfortable attic and crawl space temperatures — and the unique DNA begins to form before the building is even finished.
Once a building becomes occupied, other subtle changes happen to its makeup. Unrelated work is performed that affects envelope and insulation integrity. The cable or alarm guy disturbs the insulation in the attic, kitchen and bath fans are upgraded, changing building pressures, and so forth.
Then there are the changes made by homeowners with how they use rooms, including blocking off unused rooms, remodeling work, fireplace add-ins, and more. Thus the building’s DNA continues to mutate and evolve – or more likely – devolve.
HVAC System Variations
Starting at conception, i.e. construction, the HVAC system’s genetics are affected by many of the same factors as the building envelope. Different crews and skill levels produce diffrent results. How hot was the attic or roof during installation?
The duct system may have some unique variables like how well joints were sealed, and how tight the flex was stretched in the attic or drop ceiling. Was enough support provided on turns? Was a flex duct running horizontally to a straight boot radius and supported properly?
Add in little or no air balancing and improper refrigerant charge, and the system’s fate is locked in.
After construction, we have similar variables to the building issues: The cable or alarm guy disconnects a flex run; They cut into returns to use them as wiring chases. Homeowners seal off registers and close dampers.
Is it any wonder why each home or building is like a fingerprint, or has its own DNA string of genetic instructions?
There really is only one way to identify these mutations and defects so they can be corrected.
A doctor uses testing to determine predisposition for, and diagnoses of diabetes, cancers, abnormal organ formations, heart disease, etc. As an HVAC professional, you must have the right tools and know-how to test your patients thoroughly. You must understand when to apply which testing and when, as you investigate the causes of defects so you can offer real solutions.
The good news is today we have the best test instruments on the market. We also have the best training ever to help make this level of testing a reality. This lets you offer cost effective solutions for your customers. After all, If You Don’t Measure, You’re Just Guessing!™