A thermostat can read 70°F and the room can still feel wrong.

As buildings become tighter, humidity is increasingly becoming a separate HVAC problem rather than something the cooling coil happens to solve along the way.

One Coil Is Often Asked to Do Two Jobs

Traditional air-conditioning systems frequently use the same coil to handle:

Sensible load — lowering air temperature.

Latent load — removing moisture.

The problem is that those two requirements do not always line up.

ACHR's example describes a room that had reached the target temperature but still felt damp because the system was not controlling moisture effectively. 

To reach a very low dewpoint with one coil, the system may have to overcool the air.

That can solve one problem while creating another.

Tighter Buildings Change the Equation

Modern buildings leak less outdoor air.

That generally improves energy efficiency.

But lower air leakage also means moisture can remain trapped indoors unless ventilation and dehumidification are designed properly.

That makes dewpoint increasingly important as a performance metric. 

Temperature alone does not tell the whole comfort story.

Separating Sensible and Latent Loads Can Help

Low-dewpoint cooling strategies can separate moisture removal from ordinary sensible cooling.

That can allow the HVAC system to control humidity without driving the room temperature unnecessarily low.

The result can be:

  • Better comfort
  • More stable humidity
  • Improved IAQ
  • Better equipment sizing
  • More predictable system performance

ACHR says this approach can reshape how the entire air-side system is sized and installed. 

Why Contractors Should Care

Humidity complaints can be difficult to diagnose because the homeowner or building manager may say:

“The AC works, but it still feels uncomfortable.”

That often leads technicians to focus on thermostat temperature or equipment capacity.

The actual issue may be moisture.

Contractors capable of diagnosing latent-load problems can sell solutions involving:

Dehumidification.

Controls.

Ventilation.

Airflow correction.

Equipment staging.

Dedicated outdoor-air systems.

Comfort Expectations Are Rising

Customers increasingly expect HVAC to deliver more than a number on the thermostat.

They want:

Stable humidity.

Quiet operation.

Fresh air.

Low energy use.

No mold risk.

That expands the contractor's role from equipment installer to indoor-environment specialist.

Contractor Takeaway

The industry has spent decades asking whether an HVAC system can hold temperature.

The next question may be:

Can it hold temperature and dewpoint independently without wasting energy or sacrificing comfort?

For tighter buildings, that distinction is becoming much more important.