ARE WE SIZING TODAY’S HVAC SYSTEMS FOR TOMORROW’S WEATHER?

ARE WE SIZING TODAY’S HVAC SYSTEMS FOR TOMORROW’S WEATHER?
As costs continue to rise in the HVAC, electrical, and construction industries, there is more
pressure than ever to build homes and install equipment to the minimum requirements.
But at Heatguy LLC / Heatguy Electrical, we think there is another question worth asking:
Are we designing your HVAC system only to meet today's minimum requirements—or are
we also thinking about the conditions your home may experience over the next 10–15
years?
Here in our Marine Climate Zone 4 region, HVAC equipment is designed around established
outdoor heating and cooling design temperatures. Those numbers are extremely important
because they allow contractors to perform a proper load calculation and determine how much
heating and cooling a home requires.
But a design temperature isn't the hottest or coldest temperature that can ever occur.
When outdoor temperatures move beyond the conditions used in the load calculation, a properly
sized system may run for very long periods or continuously. Eventually, indoor temperature can
begin moving away from the thermostat setting.
That's where we believe contractors need to think beyond simply asking:
"What's the smallest system that will pass the calculation?"
At Heatguy, we'd rather ask:
"What is the best system for this particular house, this customer, and the years ahead?"
And that does NOT mean simply installing oversized equipment.
Bigger isn't automatically better.
An oversized HVAC system can create short cycling, poor humidity control, unnecessary noise,
airflow problems, higher installation costs, and potentially shorter equipment life.
Good HVAC design looks at the whole house:
• Current insulation levels
• Window size, orientation, and efficiency
• Air leakage
• Existing and proposed ductwork
• Available airflow and static pressure
• Heating and cooling loads
• Variable-speed and inverter equipment options

• Equipment turndown/modulation
• Humidity and indoor-air-quality needs
• Electrical requirements
• Future home improvements
• And reasonable additional capacity for unusually hot or cold conditions
This is especially important when we're working on an older home.
We don't believe an older house should automatically receive equipment based only on its square
footage or on whatever size furnace or air conditioner happened to be installed there 20 years
ago.
We can evaluate the house as it exists today, identify areas where insulation, air sealing,
ductwork, windows, or other improvements could reduce the load, and then design the HVAC
system around the actual home.
For customers who want it, we can also look at two different approaches:
OPTION 1 — CODE/DESIGN-BASED SYSTEM
A properly calculated system designed around the required standards and normal design
conditions.
OPTION 2 — COMFORT & LONGEVITY DESIGN
A system where we evaluate equipment modulation, duct capacity, airflow, building
improvements, and appropriate reserve capacity with extreme weather and long-term comfort in
mind—while still staying within applicable energy-code and manufacturer requirements.
The second option won't make sense for every home or every budget.
But we believe customers deserve to understand the difference.
HVAC equipment is a major investment, and many homeowners expect a new system to remain
in their house for 15 years or longer.
We can't predict exactly what the weather will look like 10 or 15 years from now. We can
experience hotter periods, colder periods, and unusual weather in either direction.
What we can do is design intelligently and give homeowners choices.
Our goal isn't to sell you the biggest HVAC system.
Our goal is to build the right system for your home—with enough thought put into the
design that you're not wishing you had made a different decision when the next extreme-
weather event arrives.
That is where Heatguy wants to be different.

Calculate it. Design it. Explain the options. Then let the homeowner decide what level of
comfort and long-term protection makes sense for their home.
Heatguy LLC / Heatguy Electrical
HVAC • Electrical • System Design • Retrofits • Custom Homes