Furnace Repair in Castle Hills - On-Site Today, Diagnosis First

Fast, Reliable Furnace Repair Across Castle Hills

Furnace repair in Castle Hills typically runs from $150 to $700, and most jobs are done the same day our technician arrives. We know the older ranch homes around Hitching Post Lane and the custom builds off Sharmain Place well enough to diagnose them quickly, because we work on them every week. If your heat has quit during a cold snap, call (361) 470-8872 and a live person answers, day or night. No phone tree, no voicemail.

Call (361) 470-8872

Castle Hills sits inside San Antonio’s loop, but it’s its own city with its own building codes and a housing stock that stopped booming around 1985. That changes how furnaces fail here. Original ductwork, aging gas valves, and heat pumps buried in oak pollen all behave differently than the newer systems we see in Stone Oak or Alamo Ranch. We send you the technician’s name and photo before we arrive, and they show you a badge at the door. You know exactly who’s walking in.

Why Brandt HVAC Co San Antonio Is Castle Hills’s Preferred Furnace Repair Company

Devin Marlowe leads our team, and he’s spent enough time inside Castle Hills closets and attics to know what works and what doesn’t in these homes. The single-story brick and stone ranchers built between the 1960s and 1980s hide furnaces in hallway closets, utility rooms, and sometimes in the attic itself. That matters because access changes everything about a repair, from parts you can reach to how long it takes.

Our Furnace Repair team handles everything from dead ignitors to cracked heat exchangers, and we always start with a written price before any work begins. That’s a rule, not a preference. You see the cost, you approve it, then we start. Every repair also includes a written guarantee. If the same failure comes back within 365 days, we return and fix it at no charge under the 365-Day Done Right Promise. That’s exactly how it sounds.

When a Castle Hills homeowner calls about a furnace that won’t light, we dispatch a technician who already knows Leyden Drive from Bridlegate Drive and understands the difference between a 1968 gas furnace and a 2015 heat pump. Background-checked, identity-verified, uniformed, and sent to you by name and photo before arrival. The Threshold Verified standard isn’t a slogan. It’s how we operate.

Furnace Maintenance in Castle Hills

Furnace Maintenance in Castle Hills typically costs $80 to $200, and given how hard these systems work from November through February, we recommend it once a year before the first cold front. A maintenance visit includes checking the heat exchanger for cracks, testing the ignitor and flame sensor, measuring gas pressure, inspecting the blower motor, and looking for the pollen and leaf buildup that hits so many Castle Hills condensers every spring.

Seasonal Tune-Up Before Winter

In Castle Hills, the most common fall mistake is waiting until the furnace has already failed. A tune-up in late October or early November catches small problems, like a weak ignitor or a dirty flame sensor, before they become a cold Tuesday night with no heat. Technicians are not paid on what they sell during a maintenance visit, so you get an honest written report of what was actually found.

Post-Spring Pollen Check

Castle Hills’s mature live oaks shed heavily each spring, and that pollen doesn’t just cover your car. It clogs outdoor condenser coils on heat pump systems, raising head pressure until the unit locks out. If your system struggled last spring, schedule a cleaning and system check before summer demand overloads it. This is one of the most common calls we handle in Castle Hills, and it’s almost entirely preventable.

Heat Pump Repair in Castle Hills

Heat Pump Repair in Castle Hills typically runs $150 to $650, and it’s a service we perform year-round because heat pumps here never really rest. Castle Hills shares San Antonio’s hot, humid subtropical climate, where cooling season stretches from April into October, but winter nights still dip below freezing often enough that the heat strips and defrost controls get real use. When a heat pump fails in Castle Hills, the problem usually traces back to a refrigerant leak, a failed reversing valve, or a clogged outdoor coil from oak litter.

High-Pressure Lockout Diagnosis

Castle Hills’s canopy of mature live oaks is beautiful shade in summer and a nuisance in spring. Pollen and leaf litter pack into the outdoor coil, airflow drops, and the system trips a high-pressure lockout. The furnace won’t run at all. We clean the coil, clear the drain lines, and test the refrigerant charge, and in most cases that avoids a compressor replacement entirely. You get honest numbers before any repair starts.

When the Defrost Board Fails

Heat pumps use a defrost board to melt ice off the outdoor coil during cold winter weather. When that board fails in Castle Hills, ice builds up, airflow stops, and your home starts cooling instead of heating. Replacing a defrost board or sensor is a straightforward repair for our team, and we stock parts for the brands we see most often in Castle Hills, including Carrier and Daikin.

Trusted Brands We Service in Castle Hills

We maintain and repair all major residential HVAC brands, and in Castle Hills we see a lot of aging American Standard, Bryant, and Carrier systems, along with the occasional 1970s Lennox still hanging on in a hallway closet. We stock common replacement parts locally for Castle Hills customers, including ignitors, flame sensors, gas valves, blower motors, and heat pump defrost controls. If your system needs a part we don’t have on the truck, we can usually source it same day from our supply network and complete the repair on the first visit.

Common Furnace Repair Problems We See in Castle Hills Homes

• High-limit trips from undersized ductwork: Many Castle Hills ranchers still run their original 1960s-era ductwork. When a new high-efficiency furnace pushes more air through ducts sized for an old 70% system, static pressure climbs and the high-limit switch shuts the furnace down. We measure static pressure and fix the duct restriction, not just the symptom.
• Propane conversion failures: Castle Hills has homes where natural gas was never extended, so they run on propane. If a homeowner switched from natural gas to propane years ago without a correct conversion kit or proper orifice sizing, the burner over-fires. That causes sooting, flame rollout, and eventually a cracked heat exchanger.
• Pollen-clogged condenser coils on heat pumps: Castle Hills’s dense live oak canopy drops heavy pollen every spring. It coats outdoor coils, restricts airflow, and causes nuisance high-pressure lockouts during shoulder season. This pattern is far less common in newer San Antonio subdivisions with sparse tree cover.
• Failing ignitors and flame sensors: The original furnaces in many Castle Hills homes still use hot surface ignitors that crack with age. A cracked ignitor means no ignition at all. Flame sensors also get carbon-coated over time and stop proving flame, shutting the system down seconds after startup.

Pricing for Furnace Repair in Castle Hills, TX

We Also Serve Cities Near Castle Hills

Our team covers Castle Hills and surrounding communities including San Antonio, Schertz, Cibolo, and Boerne. If you’re just outside Castle Hills city limits but still need a furnace repair team that understands these older homes, call us and we’ll let you know how quickly we can get to you. Dispatch and scheduling are coordinated from our Dallas-Fort Worth office, and crews serve Castle Hills locally.

FAQs About Furnace Repair in Castle Hills