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High-Performance HVAC

We don't just replace equipment. We solve comfort problems.

If one room never matches the thermostat, if the airflow has never felt right, or if somebody has already replaced your system and it still isn't fixed — that is the work we care most about. And it is measurable.

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The question we start with

“If you could move the thermostat in your home, where would you move it?”

People answer this one instantly, and the answer tells us where the system is failing to deliver. It is a better starting point than any symptom list, because it describes the house you actually live in.

How we work

Measure. Diagnose. Correct. Measure again. Prove it.

Most comfort complaints have a cause that can be measured. We find it, fix it, then run the same tests again so you can see what changed rather than take our word for it.

  1. 01

    Measure

    We start with numbers, not opinions. Static pressure, temperatures, airflow, room pressure differentials and combustion readings tell us what the system is actually doing rather than what it was designed to do.

  2. 02

    Diagnose

    The measurements point somewhere specific — a restricted return, an undersized duct, a blower fighting pressure it was never meant to see. We work out the cause rather than treating the symptom.

  3. 03

    Correct

    We fix what the readings identified. That might be new fittings, an added return, a less restrictive filter arrangement, a blower-speed change or air balancing across the house.

  4. 04

    Measure Again

    We re-run the same tests after the work. This is the step most contractors skip, and it is the only one that can tell you whether the correction actually worked.

  5. 05

    Prove Results

    You see the before and after side by side. Not a promise that it should be better — evidence that it is.

Proof

Two homes, measured before and after

Both of these were hot-and-cold-room complaints. Neither needed new equipment — they needed the duct system corrected. City only; we don't publish customer names.

Highland Park

Hot and cold rooms traced to a starved return

Rooms that would not hold temperature, with the system running hard and still not reaching the far end of the house.

Before

Static pressure
1.17
Airflow delivered
1,200 CFM
Airflow required
1,500 CFM
Return pressure
High
Filter pressure
High

After

Static pressure
0.68

What we did

  • • Added a return in the basement
  • • Changed the fitting by the furnace and filter

Pressure came down and airflow went up. The system stopped fighting its own ductwork.

Winnetka

A master bedroom that would not warm up in winter

Hot and cold rooms throughout, with a master bedroom that stayed cold through the heating season.

Before

Static pressure
1.15
Airflow by duct sizing
997 CFM
Airflow required
2,000 CFM
Return duct capacity
542 CFM
Master bedroom airflow
100 CFM

After

Static pressure
0.76
Master bedroom airflow
216 CFM

What we did

  • • New supply fittings
  • • New return fittings and drop
  • • Less restrictive horizontal filter
  • • Air balancing and air upgrades

The restrictive supply plenum and undersized return were the limit, not the equipment. Master bedroom airflow more than doubled.

What we measure

The testing toolkit

Credential

GV's is credentialed through the National Comfort Institute in air diagnostics, air balancing, combustion analysis and system performance — the four disciplines this page is built on.

Static pressure

The blood pressure of your system. High static pressure means the blower is fighting a restriction, which shortens equipment life and starves your furthest rooms.

Airflow measurement

How much air the system is actually moving, in cubic feet per minute, against how much the equipment needs to do its job.

TrueFlow Grid

A measured airflow reading taken at the air handler rather than an estimate from equipment nameplates.

Temperatures

Temperature rise or drop across the equipment, which tells us whether the system is moving the heat it is producing.

Duct testing

What your duct system can physically deliver. Frequently the real limit, and frequently nobody has measured it.

Room pressure differential

Pressure differences between rooms and the rest of the house, which explain doors that slam and bedrooms that will not hold temperature.

Combustion analysis

How cleanly and safely fuel-burning equipment is running — a safety check as much as a performance one.

Load calculations

What your home actually requires, based on its construction, orientation and windows, rather than a match to the old equipment's size.

Blower speed

Often left at a factory default that does not suit the duct system. Adjusting it can change comfort and noise noticeably.

Air balancing

Distributing the air the system produces so each room gets what it needs instead of whatever reaches it first.

Where High-Performance work usually starts

Hot & Cold Spot Solutions

Rooms that never match the thermostat are usually a measurable airflow problem, not a mystery. We measure, diagnose, correct and measure again.

HVAC Airflow Problems

Weak vents, noisy registers and rooms the air never reaches. We measure what your duct system can actually deliver and correct what is restricting it.

Air Balancing

Distributing the air your system produces so every room gets what it needs, verified with measurements before and after.

Duct Testing & Renovation

Testing what your ductwork can carry, then correcting the fittings, returns and transitions that are holding your system back. This is duct renovation, not duct cleaning.

Request an assessment

Tell us about the room that never feels right

The more detail you can give us, the better prepared we are when we arrive. If you would rather just talk it through, call us — that is usually faster.

(847) 729-9190

High-Performance Comfort Assessment

Tell us about the rooms that never feel right. The more you can tell us, the better prepared we are when we arrive.

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Common questions

Why does one room never match the thermostat?
Almost always because that room is not receiving the airflow it needs. The cause is usually a restriction somewhere in the duct system rather than a fault in the equipment, and it is measurable. We check static pressure, measure airflow room by room, and test what the ducts can actually deliver.
What is static pressure and why do you keep measuring it?
Static pressure is the closest thing your system has to a blood pressure reading. When it is high, the blower is working against a restriction — a crushed duct, an undersized return, a filter arrangement that chokes the airflow. High static pressure shortens equipment life and starves the rooms furthest from the furnace.
My last contractor replaced the equipment and it did not fix it. Why?
New equipment cannot outrun a duct system that will not carry the air. If the original problem was distribution rather than capacity, a replacement usually reproduces the same complaints with a newer unit. That is why we measure the duct system before recommending equipment.
Is this duct cleaning?
No. We do not offer duct cleaning. We do duct testing, airflow measurement, air balancing, duct repair and duct renovation — work that changes what your duct system can deliver, which is a different thing entirely.
How do I know the work actually helped?
Because we re-run the same measurements afterwards and show you both sets. On our Highland Park case, static pressure went from 1.17 to 0.68. On our Winnetka case, master bedroom airflow went from 100 CFM to 216 CFM. You see the numbers, not a reassurance.
What does a High-Performance assessment cost?
Our team will go through what is involved and what it costs when you call. Estimates on new equipment are free, and a Comfort Advisor verifies sizing with a load calculation before recommending anything.