WHY DOES MY HOUSE
FEEL HUMID EVEN WITH
THE AC RUNNING?
Your AC is cooling the air — but not removing enough moisture. This is one of the most common complaints Bradford hears during Arizona's monsoon season. Here's exactly why it happens and how to fix it.
4.8· 276 Google ReviewsTHE REAL REASON YOUR HOUSE FEELS HUMID
How Single-Stage AC Handles Humidity (Poorly)
Most Arizona homes have single-stage AC systems — they run at 100% capacity or not at all. When the thermostat calls for cooling, the system blasts on at full power. In monsoon season, it reaches your temperature setpoint in 10–15 minutes, then shuts off.
The problem: moisture removal requires sustained airflow over the cold evaporator coil. A 10-minute run cycle isn't long enough to dehumidify the air. The house cools down, but the humidity stays.
This is called "short-cycling" — and it's the #1 cause of humidity complaints during Arizona's monsoon season. It's not a malfunction. It's how single-stage systems work.
The Short-Cycling Cycle
Thermostat calls for cooling
Outdoor humidity is 55% from last night's monsoon storm. Indoor humidity is 58%.
Single-stage AC blasts on at 100%
System runs at full capacity. Temperature drops quickly.
Temperature setpoint reached in 12 minutes
The house is 76°F. But the system hasn't run long enough to remove moisture.
AC shuts off. Humidity stays at 56%.
House feels cool but clammy. You lower the thermostat. The cycle repeats.
You buy a dehumidifier
You're treating the symptom, not the cause. The real problem is your AC system.
THE SOLUTION: VARIABLE-SPEED AC
The Trane XV18 and XV20 variable-speed systems solve the humidity problem permanently — no separate dehumidifier needed.
Trane XL18 — Two-Stage
Runs at high (100%) or low (67%) capacity. In low-speed mode, the system runs longer cycles — significantly better humidity removal than single-stage. Starting around $10,500–$13,000 installed.
- Better humidity control than single-stage
- Quieter operation (68 dB vs 72 dB)
- 10-year compressor warranty
- Good for most West Valley homes
Trane XV20 — Variable-Speed
Best for Humidity Control750 stages of capacity (40–100%). Runs continuously at the exact level needed. Dedicated humidity control mode keeps running after temperature setpoint is reached — specifically to dehumidify. Starting around $12,000–$16,000 installed.
- Advanced dehumidification mode
- Maintains humidity independently of temperature
- TLINK360 thermostat monitors humidity
- No separate dehumidifier needed
- 12-year compressor warranty
THE BRADFORD POSITION ON DEHUMIDIFIERS
"Most HVAC companies sell you a $3,000–$6,000 whole-home dehumidifier to fix a problem that the right AC system would have prevented. Bradford installs variable-speed Trane XV systems that handle both temperature and humidity — no separate dehumidifier needed. If you're already replacing your AC, upgrading to the XV18 or XV20 costs less than buying a new single-stage system plus a dehumidifier."
— Ken Baker, Bradford Heating & Cooling · AZ ROC# 353859
BEFORE YOU REPLACE YOUR SYSTEM — CHECK THESE FIRST
If your system is less than 10 years old, Bradford will check these issues before recommending a replacement:
Low Refrigerant
Low refrigerant reduces the system's ability to absorb heat and moisture. Bradford checks levels on every service call.
Refrigerant recharge: $150–$400
Dirty Evaporator Coil
A clogged coil can't absorb moisture effectively. Coil cleaning is part of Bradford's $59 tune-up.
Tune-up: $59
Airflow Restriction
A dirty filter or blocked return air vent reduces airflow over the coil, limiting dehumidification.
Filter replacement: $20–$40
Oversized System
An oversized AC short-cycles and can't dehumidify. Bradford performs Manual J sizing before any replacement.
Free consultation
COMMON QUESTIONS
RELATED BRADFORD SERVICES
Trane XV20 — Best for Humidity
Variable-speed system with dedicated humidity control mode.
Learn more →
Trane XL18 — Two-Stage
Better humidity control than single-stage at a lower price than XV20.
Learn more →
$59 AC Tune-Up
Bradford checks refrigerant, coil, and airflow — all humidity factors.
Learn more →