24/7
Emergency HVAC Repair
Rapid response for total system failures, refrigerant leaks, and dangerous electrical faults — any hour, any day.
Call for emergency repairWhen your heating or cooling system fails in the Texas heat or a surprise cold front, Sentry Climate Systems is on call — day or night — to restore comfort to your home or business.
60 min.
Avg. Response
24/7
Live Dispatch
4.9★
Customer Rating
Locally owned by Sentry Bilag · 2025 McKinney St, Houston, TX
Diagnostic Included
Free on repairs
Lightning
Rapid Dispatch
From midnight breakdowns to planned installations, our certified Houston team covers the full spectrum of heating and cooling needs.
24/7
Rapid response for total system failures, refrigerant leaks, and dangerous electrical faults — any hour, any day.
Call for emergency repair
Diagnosing strange noises, weak airflow, frozen coils, and warm air complaints across all major AC brands.
Schedule a repair
Properly sized, high-efficiency cooling systems installed with precision load calculations and clean ductwork integration.
Get a free estimate
Seasonal tune-ups that keep energy bills low, extend equipment life, and prevent surprise breakdowns in Houston summers.
Book a tune-up
Installing and repairing energy-efficient heat pumps perfect for Houston's mild winters and humid summers.
Talk to an expert
Reliable steam and hydronic boiler repair, retrofit, and replacement for historic Houston homes and commercial spaces.
Request service
Removing allergens, dust, and mold from your ductwork while sealing leaks that waste conditioned air.
Improve air qualityCan't find what you need?
We handle commercial refrigeration, rooftop units, and mini-splits too.
If your system isn't listed, our team is happy to walk you through options tailored to your property.
Ask us anythingNo runaround. No vague ETAs. Here's exactly what happens when you call Sentry Climate Systems.
A real Houston dispatcher answers around the clock. We gather symptoms and your address.
The nearest certified technician is routed to your property — typically within 60 minutes.
We pinpoint the root cause, explain your options in plain English, and quote upfront pricing.
Most issues are fixed on the first visit with our fully stocked trucks. We leave your space clean.
We built our reputation the old-fashioned way: showing up on time, fixing things right the first time, and charging what we quote.
Locally Owner-Operated
Founded by Sentry Bilag, our small Houston team treats every home like our own.
Certified, Background-Checked Techs
Every technician is EPA-certified, drug-tested, and uniformed for your peace of mind.
Upfront, Flat-Rate Pricing
You'll see the exact price before any work starts — never hourly surprises on your bill.
Stocked Service Trucks
Most jobs completed in a single visit — no waiting days for parts to ship.
Respectful, Clean Crews
We wear boot covers, lay down drop cloths, and haul away old equipment and debris.
"Sentry came out at midnight when our AC died during a heatwave. They diagnosed the capacitor in 15 minutes and had us cool again before bed. True professionals."
Maria R.
Heights neighborhood, Houston
Background-Checked
On-Time Guarantee
100% Satisfaction
No Hidden Fees
From emergency midnight calls to planned system replacements — here's why Houston families keep our number saved.
"Our heat pump failed on Christmas Eve. Sentry Bilag's team showed up in under an hour. Honest price and a friendly attitude even at 11pm. Highly recommend."
James D.
Montrose, Houston
"Had three quotes for a new AC system. Sentry's was the most detailed and fairly priced. The crew was respectful, clean, and finished a day early. Cool house, lower bill!"
Amanda P.
Memorial, Houston
"My restaurant kitchen went down on a Saturday night. Sentry had a tech on site in 40 minutes. Saved my dinner service. Forever my go-to HVAC company."
Luis C.
East Downtown, Houston
Answers to the questions our Houston customers ask most often about emergency HVAC service.
Call (713) 255-8987
Sentry Bilag grew up fixing things around his grandmother's East End home — the kind of house where a broken AC in August wasn't an inconvenience, it was an emergency. After a decade working for the largest HVAC contractors in Texas, he saw firsthand how customers were treated like ticket numbers instead of neighbors.
In 2018, Sentry founded Sentry Climate Systems with a single promise: show up fast, fix it right, charge fairly. Today, every technician on his team is trained to honor that promise — from the first phone call to the final walkthrough.
8+
Years Serving Houston
2,400+
Happy Customers
12
Certified Techs
We exist to keep Houston families comfortable, safe, and informed — three values that drive every estimate, repair, and installation we complete.
Deliver honest, around-the-clock HVAC service that protects Houston homes, businesses, and the people who depend on them.
To be Houston's most trusted name in residential and light commercial climate comfort — recommended by every neighbor we serve.
Integrity first. Speed with skill. Respect every home. Fair pricing. Continuous training. Treat every dollar like it's our own.
Houston is unlike any other HVAC market. Our coastal humidity, salt air, severe storms, and 100°+ summers put extraordinary stress on heating and cooling systems. Generic repair playbooks don't work here.
Every technician on our team completes Sentry Bilag's proprietary Gulf-Coast training curriculum — covering mold prevention in ductwork, hurricane-prep shutdowns, high-efficiency dehumidification, and rooftop unit challenges across historic Houston neighborhoods.
100°+
Triple-digit summer days handled
8 yrs
Average tech tenure
Gulf
Coastal corrosion training
Local
Parts warehouses nearby
A comprehensive breakdown of every service our Houston team performs — from emergency no-cool calls to complete system design.
Compressor replacement, refrigerant leak repair, condenser coil cleaning, capacitor and contactor swaps, thermostat calibration.
Manual J load calculations, high-SEER system design, ducted and ductless mini-split installations for homes and light commercial.
Cold-climate heat pump retrofits, reversing valve diagnostics, defrost control board repair, and inverter-driven system optimization.
Gas, electric, and propane boilers, circulator pump replacement, zone valve diagnostics, expansion tank service, and full retrofits.
Bi-annual precision tune-ups, coil cleaning, refrigerant charge verification, drain line clearing, electrical tightening, and filter replacement.
Negative-pressure duct cleaning, mold and allergen removal, aeroseal leak sealing, and return-air balancing for maximum efficiency.
Our dispatchers and on-call technicians are available 24/7 — weekends, holidays, and severe weather events — for total system failures, gas odors, water leaks, and electrical hazards. Call (713) 255-8987 any time.
Don't sweat through another Houston night. Call our emergency line and a certified technician will be at your door — typically within the hour.
60min
Avg. ETA
24/7
Live Help
98%
1-Trip Fix
Stop by our McKinney Street location for in-person consultations, equipment pickups, or to meet the team keeping Houston cool.
Skip the phone tree. Whether you need emergency repair, a new installation estimate, or general HVAC advice, our local team responds fast.
From midnight breakdowns to same-week installations, our live Houston team answers fast — most calls returned within 10 minutes, every time.
Need Emergency HVAC Help?
Call our 24/7 emergency dispatch line for immediate assistance — we dispatch every call live.
(713) 255-8987Quick answers about scheduling, estimates, and what to expect when contacting Sentry Climate Systems.