On this page ▾
- Table of Contents
- Safety First: Read Before Touching Anything
- Step 1: Check the Thermostat Settings
- Step 2: Inspect Air Filters
- Step 3: Check Electrical Breakers
- Step 4: Look for Ice
- When to Call a Professional
- Have Questions About Your HVAC System?
- Need Emergency HVAC Service?
- Related HVAC Services
- Our HVAC Service Guarantees
- 100% Satisfaction Guarantee
- 60-90 Minute Response
- Licensed & Certified
HVAC247PRO Team
Table of Contents
100% Satisfaction
60-90 Min Response
Commercial HVAC systems operate at high voltages (208V-480V) that can be lethal.Neverattempt to open electrical panels, access rooftop units without safety gear, or touch internal components. The steps below are safe, external checks for facility managers....
Commercial HVAC systems operate at high voltages (208V-480V) that can be lethal.Neverattempt to open electrical panels, access rooftop units without safety gear, or touch internal components. The steps below are safe, external checks for facility managers....
Licensed & Insured - TACLB00105442E - Same-Day Service Available
Safety First: Read Before Touching Anything
Step 1: Check the Thermostat Settings
It sounds obvious, but 20% of "no cooling" calls are solved here. Ensure:
- The system is set to "Cool" mode, not "Fan" or "Heat."
- The setpoint is at least 3-5 degrees below the current room temperature.
- The batteries in the thermostat are fresh (if battery-powered).
- No one has accidentally engaged a "Vacation" or "Unoccupied" schedule override.
HVAC trouble can't wait in Houston heat
Our licensed techs are standing by 24/7 for fast, reliable service.
Step 2: Inspect Air Filters
A completely blocked filter stops air from moving over the cooling coils. Without airflow, the system cannot cool and may even freeze up.
- Locate your return air grilles.
- Visually inspect the filters. If they look like a gray felt blanket, they are clogged.
- Replace them immediately if you have spares. If not, remove the dirty filter temporarily to see if airflow improves (but do not run the system without a filter for more than a few hours).
Step 3: Check Electrical Breakers
Locate your building's electrical panel.
- Look for breakers labeled "HVAC," "AC," or "RTU."
- If a breaker handle is in the middle (neither ON nor OFF), it has tripped.
- Firmly switch it to OFF, then back to ON.
- CRITICAL WARNING: If the breaker trips again immediately or makes a loud pop, STOP. Do not reset it again. This indicates a direct electrical short that could cause a fire. Call us immediately.
Step 4: Look for Ice
Check the copper refrigerant lines running to the unit (often visible in mechanical rooms or near the ceiling). If you see white frost or solid ice:
- Turn the system OFF immediately.
- Switch the fan setting to "ON" to help thaw the ice.
- Call for service. A frozen system cannot be repaired until it is thawed, which takes hours. Turning it off now saves time later.
When to Call a Professional
If you've checked the thermostat, filters, and breakers and the system still isn't cooling, or if you encounter:
Grinding, screaming, or banging sounds.
Electrical or rubber burning odors.
Water dripping from ceilings or vents.
System runs but blows warm air.
It's time to call HVAC247PRO. These symptoms indicate mechanical failures like bad capacitors, refrigerant leaks, or failed compressors that require licensed repair.
Have Questions About Your HVAC System?
Our licensed technicians are ready to help. Get expert advice from Houston's trusted Commercial HVAC professionals.
Need Emergency HVAC Service?
Related HVAC Services
AC Repair
Expert commercial AC Repair services
AC Installation
Professional AC Installation
AC Maintenance
Preventive maintenance plans
All services performed by TX Licensed Contractor TACLB00105442E
About HVAC247PRO Team
Our licensed HVAC technicians specialize in Commercial HVAC systems for Friendswood's big institutions. With Texas license TACLB00105442E and over 15 years of experience, we provide expert guidance on HVAC maintenance, repair, and installation for commercial properties.
Our HVAC Service Guarantees
100% Satisfaction Guarantee
We stand behind our work. If you're not completely satisfied, we'll make it right.
60-90 Minute Response
Licensed & Certified
TX License TACLB00105442E. All technicians are certified and background-checked.
We use cookies to improve your experience. By continuing, you agree to our use of cookies.
Frequently Asked Questions
What should you know about Step 1: Check the Thermostat Settings?
It sounds obvious, but 20% of "no cooling" calls are solved here. Ensure:
What should you know about Step 2: Inspect Air Filters?
A completely blocked filter stops air from moving over the cooling coils. Without airflow, the system cannot cool and may even freeze up.
What should you know about Step 4: Look for Ice?
Check the copper refrigerant lines running to the unit (often visible in mechanical rooms or near the ceiling). If you see white frost or solid ice:
When to Call a Professional?
If you've checked the thermostat, filters, and breakers and the system still isn't cooling, or if you encounter:
What should you know about Our HVAC Service Guarantees?
We stand behind our work. If you're not completely satisfied, we'll make it right.
