Can one company repair both my heating and my AC in Katy?

Yes, and that is exactly what HVAC repair means. A Class A Texas license (ours is TACLA72152E) covers gas furnaces, heat pumps, air handlers, thermostats, and ductwork, so a single licensed contractor can repair both systems. You do not need a separate heating company and AC company. We fix both in one visit, with one warranty and one service record. Call (713) 598-2737.

My furnace worked fine last spring but won't turn on now. What happened over the summer?

This is the most common first-cold-front failure in Katy. Gas furnaces here sit idle 7 to 8 months a year, and over that stretch flame sensors oxidize and hot surface ignitors turn brittle. On the first cold night the furnace tries to fire and fails, usually lighting for a few seconds then quitting (flame sensor) or not igniting at all (ignitor). Both parts ride on our trucks, and most finish in one visit for $100 to $300.

My heating and AC both stopped at the same time. What does that mean?

It usually means one shared part failed, not two systems. Your AC and furnace share an ECM blower motor, an integrated control board, a thermostat, and often a single circuit. A failed blower, a dead board, a thermostat fault, a tripped breaker, or a float-switch lockout can shut both sides down at once, and the repair is almost always far smaller than the panic suggests. We diagnose the shared components first.

Is a cracked heat exchanger dangerous, and should I repair or replace my furnace?

Yes. A cracked heat exchanger can leak carbon monoxide into the air your furnace circulates, which is why we inspect it on every furnace call and recommend a CO detector (Texas has no statewide law requiring one). Replacing just the exchanger often approaches the cost of a new furnace, so if your unit is 9 years or older and a crack is confirmed, replacement is usually safer and more economical. We give you both prices in writing.

What does HVAC repair cost in Katy in 2026, and is heating repair more expensive than AC repair?

Most Katy HVAC repairs run $150 to $900. Heating examples: flame sensor $95 to $185, ignitor $115 to $200, draft inducer $300 to $650, heat exchanger $800 to $2,000. Cooling examples: capacitor $150 to $350, refrigerant recharge with leak diagnosis $300 to $650, compressor $1,400 to $2,800. Heating repairs usually cost less per call than compressor-level AC work. Our diagnostic is $85, waived with an approved repair.

Should I repair my HVAC system or replace the whole thing? What's the rule of thumb?

Use the $5,000 rule: multiply the repair cost by the system's age in years. Over $5,000 usually favors replacement. Then apply the Katy modifier, because systems here run 2,000 to 2,400 hours a year versus 1,200 nationally, so a 10-year-old Katy unit has worn like a 14-to-16-year unit. A single-part fix on a newer system is almost always worth repairing. We provide a side-by-side written comparison at no charge.

Why won't my heat pump heat my Katy home during a freeze or cold snap?

One of these is not even a failure. During a freeze a heat pump runs a defrost cycle that briefly feels like cold air, which is normal. Below about 35°F, capacity drops and the system should switch to backup electric heat strips (auxiliary heat). If the aux heat never engages, the usual causes are a failed sequencer or relay, thermostat wiring that doesn't signal O/B correctly, or an iced-over outdoor unit. The 2021 and 2024 freezes exposed many Katy heat pumps with weak aux backup; we diagnose it same-day.

A company told me to replace my whole system instead of repairing the furnace. How do I know that's right?

Ask to see the failed part and a meter reading, then get the repair price and the replacement price in writing, side by side. A legitimate replace call comes with evidence: a confirmed cracked heat exchanger, a dead compressor, or a repair cost that clears the $5,000 rule for the system's age. If they jump to replace it all without showing you a failed component, get a second opinion. We give one, and we repair far more of these than we replace.

Do you repair HVAC in Cinco Ranch, Elyson, Cane Island, Cross Creek Ranch and Kelliwood, both heating and cooling?

Yes, all of them, both systems. We cover Cinco Ranch (77450 / 77494), Elyson and Cane Island (77493), Cross Creek Ranch (77441), Kelliwood (77450), Bear Creek (77449), Firethorne, Tamarron, Grand Lakes, and Seven Meadows (77494). We dispatch from the west side of Houston and have run Katy gate codes since 2016, so a call before mid-afternoon gets a confirmed same-day window. Call (713) 598-2737.

HVAC Repair in Katy, TX: AC, Heating, Heat Pumps & Ductwork, One Call

Q: What's the difference between HVAC repair and AC repair in Katy?

HVAC repair covers your entire comfort system: the air conditioner, the furnace or heat pump, the thermostat, and the ductwork. AC repair fixes only the cooling side. If your heat quit, your thermostat lost the system, or both sides failed at once, that is an HVAC repair call. 75 Degree AC holds TACLA72152E (Class A) and handles both, dispatched from Houston to Katy.

Looking for dependable HVAC services in Katy, TX? 75 Degree AC delivers expert air conditioning, heating, and indoor air quality solutions for homes and businesses, helping you stay comfortable in every season.

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HVAC Repair in Katy, TX

75 Degree AC repairs air conditioning systems, furnaces, heat pumps, ductwork, and thermostats across Katy, Texas, one contractor, one license (TACLA72152E, Class A), for every HVAC failure in every season. We serve Cinco Ranch, Kelliwood, Elyson, Cane Island, and Firethorne (ZIPs 77449, 77450, 77493, 77494). Same-day service, 24/7 emergency dispatch. Call (713) 598-2737.

Katy weather makes your home run two systems hard. Summer brings 102+ days a year above 90°F at 74.7% average humidity (NOAA, weather.gov/hgx), so your AC runs April to October. Then a January cold front drops the design temperature to roughly 26°F, and the furnace you ignored all summer has to light on the first try. The same house needs a working AC in July and a working furnace in January. That is the gap we fill: one call to (713) 598-2737 reaches a technician licensed for heating *and* cooling, who shows you the failed part on a meter before quoting a price and tells you the truth about repairing it versus replacing the whole system. We have worked Katy gate codes since 2016 and dispatch from the west side of Houston, so a call before mid-afternoon gets a confirmed arrival window. The diagnostic is flat and waived when you approve the repair.

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What HVAC Repair Covers vs AC Repair in Katy

HVAC repair covers your whole comfort system: the air conditioner, the furnace or heat pump, the thermostat, and the ductwork that moves air through both. AC repair fixes only the cooling side. If your heat quit, your thermostat lost the system, or the AC and the furnace failed together, that is an HVAC repair call. If only the air conditioner is struggling in summer, that is straight AC repair in Katy.

The distinction matters because of how Texas licenses work. A Class A air-conditioning license (ours is TACLA72152E) covers gas furnaces, heat pumps, air handlers, refrigerant work, and electrical controls, both sides of the system. You do not need a separate "heating company" and "AC company," and because the two systems share an air handler, a blower, a control board, and a thermostat, splitting the work between two contractors is how problems get misdiagnosed.

What AC repair covers	What HVAC repair covers
Cooling only (condenser, evaporator coil, refrigerant)	Cooling and heating (furnace, heat pump, gas, electric)
Capacitor, contactor, compressor, condenser fan	All AC parts plus ignitor, flame sensor, heat exchanger, gas valve
Summer no-cool calls	No-cool, no-heat, and both-at-once failures
Cooling thermostat faults	Full thermostat and control-board diagnosis (both modes)
One season	Two seasons, one service record, one warranty

This page is for the whole system, and for the times you cannot tell which half broke.

HVAC Problems We Repair in Katy Homes

We repair every common heating and cooling failure Katy homes throw at us, and we stock the parts for both sides on the truck. Each symptom below has a different cause, and a few get misread as a “dead system” when the real fix is one part.

AC not cooling. Warm air from the vents in summer usually traces to a failed run capacitor, a tripped contactor, a low refrigerant charge from a leak, or a frozen coil. This is cooling-only work; see our AC repair in Katy page for the full breakdown.
Furnace won’t ignite. A furnace that clicks and fails, or lights for a few seconds then shuts off, is almost always a dirty flame sensor or a cracked hot surface ignitor. These fail on the first cold front after sitting idle 7 to 8 months.
Heat pump blowing cold air. During a freeze, a heat pump runs a defrost cycle that feels like cold air for a few minutes, which is normal. A true fault is usually a reversing valve, a stuck defrost board, or auxiliary heat strips that never engage below 35°F.
Weak or no airflow and duct issues. Rooms that never get comfortable in either season point to a failing ECM blower motor, a clogged filter, or leaking ductwork. ENERGY STAR estimates typical homes lose 20 to 30% of conditioned air to duct leakage, and that loss costs you both seasons.
Thermostat faults. A blank screen, a system that ignores the setpoint, or heat and cool fighting each other often traces to thermostat wiring or a failed integrated control board, not the AC or furnace itself.
Short-cycling. A system that starts and stops every few minutes is overheating, low on charge, or reading a bad sensor. Left alone, short-cycling burns out compressors and blower motors.

When Your Heating and AC Both Stop at Once

When your heating and cooling both quit, the cause is usually one shared part, not two dead systems. Your AC and furnace share an air handler, an ECM blower motor, an integrated control board, a thermostat, and often a single circuit. Knock out any one of those and both systems go dark at once, and the panic (“our whole system is gone”) rarely matches the repair bill. Here is what we check first when both sides are down:

The shared ECM blower motor moves air for heating and cooling, so a failed blower stops both.
The integrated control board runs ignition and cooling relays from one board; when it dies, neither side responds.
The thermostat commands both modes, so a wiring fault or dead thermostat reads as total failure.
A tripped shared breaker or a float-switch lockout (the safety that cuts power when the condensate pan fills) shuts everything off at the panel.

In Bear Creek and other 1990s-era 77449 homes on a single 2008-vintage system, a shared blower or board is the most common reason both sides die in the same week. We diagnose the shared parts before anyone mentions replacing a system. No cooling-only or heating-only contractor can answer this, because the failure lives where the two systems overlap.

Is a Cracked Heat Exchanger Dangerous? Furnace & CO Safety

Yes, a cracked heat exchanger is a real safety hazard, because the crack lets combustion gases (including carbon monoxide) mix into the air your furnace pushes through the house. Texas has no statewide law requiring a residential CO detector, so the burden is on you and your contractor to catch it. We inspect the heat exchanger on every furnace call, and we recommend a CO detector near sleeping areas in every Katy home with gas heat.

The urgent signs: a yellow or flickering burner flame instead of steady blue, a sulfur or hot-metal smell near the vents, soot around the furnace, or a CO detector reading above 30 ppm. If you see them, shut the system off at the thermostat and call (713) 598-2737. We will not patch a cracked exchanger to keep a sale; if the crack is confirmed and the furnace is 9 years or older, replacement is usually safer and more economical, and we put both prices in writing so you decide. Many exchangers we condemn in Katy sit in 2005 to 2015 furnaces that ran flat-out through Winter Storm Uri in 2021 and have aged toward failure since.

Same-Day & 24/7 Emergency HVAC Repair Across Katy

We offer same-day HVAC repair across Katy when you call before mid-afternoon, and 24/7 emergency dispatch the rest of the time. A call before roughly 3 PM Monday through Saturday gets a confirmed Katy arrival window at booking, not a vague “sometime today.” After hours, the diagnostic is a flat fee with no surcharge stacked on top.

We dispatch to Katy from the west side of Houston, not from a call center three states away, and we have run these gate-code neighborhoods since 2016:

Cinco Ranch (77450 / 77494)
Kelliwood (77450)
Bear Creek (77449)
Elyson (77493)
Cane Island (77493)
Cross Creek Ranch (77441 / Fulshear-Katy)
Firethorne, Tamarron, Grand Lakes, Seven Meadows (77494)

Whether it is a no-heat night during a January freeze warning or a no-cool afternoon in an August heat wave, one number reaches a technician for both systems: (713) 598-2737.

HVAC Repair Pricing in Katy, TX: AC & Heating Line Items

Most Katy HVAC repairs land between $150 and $900, depending on the part. Below is the breakdown for both your AC and your heating, the first Katy HVAC page to publish component pricing across both sides. These are ranges, not quotes; you get the exact figure in writing before any work starts, and the diagnostic comes off the invoice when you approve the repair.

Repair	Typical Katy price range	System side	Common cause
Diagnostic fee	$85 (waived with approved repair)	Both	Up front, no stacking
Hot surface ignitor	$115 to $200	Heating	#1 no-heat failure at first cold front
Flame sensor	$95 to $185	Heating	Oxidizes over the idle summer; furnace lights then quits
Run/start capacitor	$150 to $350	Cooling	#1 AC failure; Houston heat degrades capacitors
Contactor	$150 to $300	Cooling	Fire ants nest in and short the contactor (a Katy classic)
ECM blower motor	$300 to $600	Shared	Moves air for heating and cooling; common both-down cause
Draft inducer motor	$300 to $650	Heating	Pressure-switch or venting fault
Refrigerant recharge with leak diagnosis	$300 to $650	Cooling / heat pump	R-410A now $75+/lb; never recharge without finding the leak
Heat exchanger	$800 to $2,000	Heating	Cracking is a CO risk; repair-vs-replace trigger
Evaporator coil	$900 to $1,800	Cooling	Corrosion from Houston humidity, or leaks
Compressor	$1,400 to $2,800	Cooling / heat pump	Repair-vs-replace trigger on older units

The takeaway: heating repairs usually cost less per call than compressor-level cooling work, and most single-part failures finish well under $400. The big-ticket items (heat exchanger, coil, compressor) are exactly where you want a written repair-versus-replacement comparison before spending a dime.

Our Repair-First Promise: We Diagnose Before We Quote

We diagnose the system and show you the failed part before we quote a price, every time. We do not earn more on a $12,000 system than on a $180 ignitor, so the incentive to oversell is off the table. If a part fixes it, we fix the part; if replacement genuinely makes more sense, we show you the math and let you choose.

Here is exactly what happens when you call:

You call (713) 598-2737 and we book a confirmed Katy arrival window, with the diagnostic fee disclosed up front.
A licensed technician arrives and diagnoses both sides with gauges and a meter, not a guess.
We show you the reading: the weak capacitor, the corroded flame sensor, the shorted contactor, the value next to the spec.
You get a written quote with part, labor, and total before we start, plus a replacement price beside it when the repair is borderline.
We fix it, usually the same visit, because our trucks carry both AC and furnace parts.

“On a no-heat call, the cheapest honest fix is often a $20 flame sensor and ten minutes of cleaning,” says Kenny Ho, our lead technician (EPA 608 Universal certified). “If a contractor skips the meter and jumps straight to quoting a new system, that is the tell.” That is the standard we hold on every Katy call.

Repair or Replace Your Katy HVAC System? The 2026 Decision

Repair when the fix is a single part and the system is under 10 to 12 years old; lean toward replacement when the repair cost times the system's age in years clears roughly $5,000, or when a major component (compressor, heat exchanger) fails on an aging unit. Katy adds its own math: systems here run 2,000 to 2,400 hours a year against a national average near 1,200, so a 10-year-old Katy system has the wear of a 14-to-16-year unit elsewhere.

Five 2026 factors that should weigh on the decision:

R-410A refrigerant cost. R-410A climbed from $20 to $30 per pound in 2020 to $75+ per pound in 2026 under the EPA AIM Act phase-down, which hits both AC and heat-pump repairs; a recurring leak on an old system gets expensive fast. New equipment uses R-454B or R-32.
The DOE 2028 furnace rule. New furnaces must meet a 95% AFUE minimum starting December 18, 2028 (DOE / ACHR News). An 80% furnace is still legal to repair and run today, but a *replacement* after that date must be high-efficiency, so a near-end-of-life furnace factors that timeline in now.
Cooling efficiency (SEER2). Texas requires a minimum 14.3 SEER2 (DOE South region); for Katy's cooling load we recommend 16 or higher.
Heating efficiency in a mild winter. With a January design temp near 26°F, an 80% AFUE furnace is genuinely adequate in Katy. The payback on a 96% condensing furnace is slower here than in a cold climate, and we will tell you that.
Rebates (enrollment-neutral). Up to $500 on a qualifying ENERGY STAR heat pump, plus a smart-thermostat rebate, may be available through CenterPoint. We are not a confirmed participating contractor, so we point you to the program rather than file for you. (There is no federal 25C tax credit in 2026; it expired December 31, 2025.)

Decision factor	Lean repair	Lean replace
System age	Under 10 years	12+ years (Katy wear adjusts this down)
Repair cost × age	Under $5,000	Over $5,000
Refrigerant	R-454B / R-32 (new)	R-410A with a recurring leak
Failed part	Capacitor, ignitor, sensor, contactor	Compressor or cracked heat exchanger

When replacement is the right call, our AC installation in Katy team handles the swap and pulls the permit (issued by the City of Katy in 77493, Harris County in 77449 and 77450, and Fort Bend County in 77494).

Brands & Models We Repair in Katy

We repair every major HVAC brand, on both the heating and the cooling side, and we carry the tools to read each manufacturer’s fault codes. Most Katy competitors list brands; almost none name the actual models, which matters when you need parts for a specific furnace or condenser.

Carrier: Infinity 24ANB7 AC and Infinity 59MN7 gas furnace (98.5% AFUE)
Trane: XV20i AC and S9V2 two-stage furnace (96% AFUE)
Lennox: Signature SL28XCV AC and SLP99V variable-speed furnace
Goodman: GSXC18 AC and GMVC96 variable-speed furnace (96% AFUE)
Rheem / Ruud: Prestige series heat pumps and air handlers
Daikin / Amana: Fit DX20VC and Amana high-efficiency furnaces
American Standard and all other major brands, including the furnace LED fault-code lines we see in Katy

If your equipment is not on this list, call (713) 598-2737. We service it.

Why Katy Homeowners Call 75 Degree AC First

One Class A license for both systems

TACLA72152E covers heating *and* cooling, so one call fixes your AC in July and your furnace in January: one tech, one record, one warranty. Verify it at tdlr.texas.gov.

We show you the failed part before we quote

The ignitor, the flame sensor, the capacitor, the meter reading, with repair and replacement prices side by side in writing. That rebuts the "they pushed a $12K system" pattern on a repairable unit.

Flat, waived diagnostic, honest refrigerant

The diagnostic comes off the invoice when you approve the repair, and we never top off refrigerant without finding and quoting the leak first.

We actually drive to Katy, same day

We dispatch from the west side of Houston and have run Katy gate codes since 2016; calls before mid-afternoon get a confirmed window.

Trucks carry both sides

Capacitors and contactors *and* ignitors, flame sensors, and control boards, so most repairs finish on the first visit.

A named, certified technician

Kenny Ho holds EPA 608 Universal and works Carrier, Trane, Lennox, Goodman, Rheem, and Daikin on both furnace and AC lines. Licensed and fully insured.

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Get Same-Day HVAC Repair in Katy: Call (713) 598-2737

One call covers both your heating and your cooling. When the AC quits in an August heat wave or the furnace won’t light on the first January cold front, we dispatch a licensed technician to Katy the same day (call before mid-afternoon for a confirmed window), show you the failed part before we quote, and finish most repairs on the first visit because the part is already on the truck. The $85 diagnostic is waived when you approve the repair, and the price is in writing before we start.

Call (713) 598-2737 now, or request service online for a callback. TACLA72152E, Class A, licensed and fully insured, serving Katy since 2016.

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