When a system stops working in Kirby, the job might be a single faulty part or it might be everything from the air handler down to the ductwork. Magnum Heating & A/C handles the full range, from diagnosing a component that failed on an otherwise sound system to pulling out equipment that has run its last season and replacing it with something sized correctly for the space. We work on central air, furnaces, heat pumps, mini-splits, thermostats, and ductwork, and we handle both residential and commercial calls across the town.
Kirby is a compact town with a mix of older homes and smaller commercial properties, and the HVAC work that comes out of it reflects that. Systems that have been running for years without a real inspection, rooms that never quite reach the right temperature, and equipment approaching the end of its useful life are all situations we see regularly here. Whatever the starting point, the job gets the same attention: find the actual problem, explain it plainly, and fix it right. Call (830) 590-9782 to get started.
Pricing on HVAC work depends on what the job turns out to be, not just what it looks like from the outside. A system that seems like a simple repair can open up into something more involved once the technician is on site. What moves a quote is the nature of the fault, what has to be accessed to fix it, whether a repair still makes economic sense given the age and condition of the equipment, and what parts are involved. None of those things can be settled before the visit, which is why we give you the rate on the phone once we understand the situation, not before.
When you call, we ask about the system, what it is doing or not doing, and how long the problem has been going on. From that conversation we can give you a clear picture of what the visit covers and what you can expect to pay before anything is scheduled. You are not agreeing to work you have not seen explained. Affordable rates. Flexible timing. Reliable comfort.
Calling an HVAC company does not have to be stressful, and knowing what to expect helps. When a technician arrives at your Kirby property, the first thing that happens is a proper look at the system, not a quick glance before the upsell. The technician checks the equipment, runs through the relevant diagnostics, and traces the problem to its actual source.
Before any work is authorized, you get a clear explanation of what was found and what the recommended fix involves. If the scope changes once the job is open, that conversation happens before anything additional is done. We treat your home and its system the way we would our own, which means the technician does not start work and then explain the bill afterward. You know what you are agreeing to first.
The size and character of a place shapes the kind of calls that come in. Kirby's housing stock tends toward established homes rather than new construction, and that means the HVAC situations we handle here are often more varied than a single season or a single system type would suggest.
A repair call usually starts with a symptom: the system is running but the house is not getting comfortable, or it quit entirely, or it is making a noise it was not making before. The technician works from the symptom back to the cause rather than replacing parts until something sticks. Air handler and blower performance, refrigerant levels, electrical controls, and airflow through the duct system are all part of a thorough diagnosis. The repair recommendation follows from what was actually found.
A system that is running does not mean a system that is running well. Seasonal tune-ups and maintenance visits catch the kind of slow deterioration that does not announce itself until the equipment fails at the worst possible time. We check the heating side before the region's cold months and the cooling side before the long stretch of summer heat, and we flag anything that looks like it is heading toward a problem. The full breakdown of what a tune-up covers is on the service page.
Some systems have reached the point where the honest answer is replacement. Recurring breakdowns, rising energy use, and repair costs that approach the value of the equipment are all signs the math has shifted. When that is the case, we walk through the replacement options, size the new equipment correctly for the property, and handle the installation from start to finish. Code-compliant HVAC work on every job means the new system goes in the way it is supposed to, not the way that is fastest.
Before booking anything, our HVAC service guide is worth a read.
Short cycling, where the system starts and stops repeatedly without completing a full run, puts unusual wear on the equipment and usually signals something that needs attention sooner rather than later. Common causes include a refrigerant charge that is off, a dirty coil restricting airflow, an oversized system that is not matched to the space, or a control board fault. We diagnose the underlying cause rather than resetting the system and leaving.
A cracked or compromised heat exchanger is a safety issue, not just a performance one. It is also something that does not always produce obvious symptoms before it becomes serious. We inspect the heat exchanger as part of a thorough furnace service, and we explain what we find clearly. If there is a problem, the options and what they involve get covered before any work is authorized.
Banging, rattling, squealing, and grinding all point to different causes. A banging noise often means something loose or broken inside the cabinet. Squealing usually comes from a blower motor or belt under stress. Grinding points to a bearing that is failing. None of these sounds should be left to run, because the underlying problem gets worse with use. We trace the noise to the source and give you a clear answer on what it takes to fix it.
These are among the more common component-level failures we diagnose on both heating and cooling equipment. A failed capacitor can prevent a motor from starting. A worn contactor affects how the outdoor unit responds to the thermostat. A control board fault can produce symptoms that look like a bigger problem than they are. Getting the diagnosis right matters here, because the wrong call means replacing a part that was not the issue.
When the heat or the AC quits, the timeline matters. Same-day service is often available for urgent calls, and we take calls every day from 9:00 AM to 9:00 PM. When a property has no heating or no cooling at all, we move those calls to the front of what is available.
For non-emergency appointments, we work around the schedule you have. If you need a window that does not require taking a full day off, let us know when you call and we will confirm what is available. Landlords managing a rental property in Kirby can arrange access separately and we will confirm the details before anyone is dispatched. We protect your home. We service your system. We earn the call.
For commercial properties and businesses that need to stay open during the visit, we account for that when we schedule. The technician knows what the space needs and works accordingly.
We cover Kirby and the communities around it throughout this part of Bexar County. That includes Windcrest, Terrell Hills, Alamo Heights, China Grove, and Converse. Whether the call comes from a home in Kirby or a property in one of the neighboring towns, the work gets handled the same way.
Local means we care what the neighbors think of our work. That applies across the full service area, not just at one address. If you are in one of these communities and unsure whether we reach your property, call and we will confirm.
Same-day service is often available, particularly for urgent situations where the system is completely down. We take calls every day from 9:00 AM to 9:00 PM, and emergency calls are prioritized when appointments are open. When you call, we confirm what is available and let you know what to expect.
Ice on HVAC equipment is almost always a sign of restricted airflow or a refrigerant problem. A clogged filter, a blocked coil, or low refrigerant from a leak can all cause the coil temperature to drop below freezing and ice to form. The system should be shut off and inspected rather than left running with ice on it.
A smart thermostat can usually be installed on an existing system as long as the wiring supports it. Most modern HVAC systems are compatible with current smart controls. We check compatibility before installation and confirm the new control is communicating correctly with the system before we leave.
Intermittent problems are worth a call. A system that runs fine most of the time but occasionally short-cycles, loses cooling, or makes an unusual noise is usually showing an early sign of something that will get worse. Catching it before it becomes a full failure is almost always less expensive than waiting.
Yes. We cover Kirby and the surrounding communities, including Windcrest, Alamo Heights, Terrell Hills, China Grove, and Converse. If your address sits near a boundary or you are not certain, call (830) 590-9782 and we will confirm coverage before you schedule anything.
A system that runs without satisfying the thermostat is usually dealing with one of three things: a refrigerant or airflow problem on the cooling side, a sizing mismatch between the equipment and the space, or a duct system that is losing conditioned air before it reaches the rooms. A full diagnostic identifies which issue is at work.
It genuinely helps. The more detail you give us about the symptoms, the better we can prepare for the visit. Let us know whether the system is running at all, what it is or is not producing, any sounds or smells you have noticed, and how long the problem has been going on.
We work with the schedule that fits the property. When you book, let us know the access situation and any constraints around the tenant's availability. We are available every day from 9:00 AM to 9:00 PM, which gives us flexibility to find a window that works.
We can discuss how to structure service across multiple addresses when you call. Whether that means scheduling the visits together or consolidating the paperwork is something we work out based on the properties involved and what is practical for the day.
Magnum Heating & A/C handles HVAC repair, maintenance, and installation for homes and businesses in Kirby and across the surrounding area. When you call (830) 590-9782, we ask about the system and give you a clear rate before anything is scheduled. If the visit leads to a repair or a replacement, you know what that covers and what it costs before the technician touches anything. We check the furnace. We check the AC. We leave it running right.
Call (830) 590-9782 now.
We also take work in: Windcrest, Terrell Hills, Alamo Heights, Live Oak.
From a fast AC repair to a full system replacement, we handle the complete range of heating and cooling work for homes and businesses in Kirby and across Bexar County. The table below covers what each service includes, who it fits best, and a practical note to help you decide where to start. Call (830) 590-9782 for a quote on any of these services.
| Service Type | Scope of Work | Common Needs | Helpful Details |
|---|---|---|---|
| Furnace & AC System Replacement |
| Homeowners whose repair costs are stacking up or whose system can no longer hold the set temperature | South Texas summers accelerate wear on older equipment, making timely replacement a practical choice |
| Heating & Furnace Repair |
| Any home or building that loses heat during a cold snap | Even mild Kirby winters can make a furnace failure urgent on the coldest nights |
| Seasonal Maintenance & Tune-Ups |
| Any homeowner who wants to prevent breakdowns before the next season arrives | A spring AC tune-up and a fall furnace check are the two visits that prevent the most expensive repairs |
| Indoor Air Quality & Air Filtration |
| Households concerned about dust, allergens, or airborne particles indoors | An air quality upgrade is straightforward to add when the system is already being serviced |
| Ductwork Repair & Sealing |
| Homes where the system runs constantly but comfort is uneven from room to room | Sealing the duct system often makes a bigger difference in comfort than replacing equipment |
| Heat Pump Repair & Service |
| Homes running a heat pump for both heating and cooling | Heat pumps are a common fit in South Texas and benefit from annual inspection of both modes |
| Whole-Home Dehumidification & Humidity Control |
| Bexar County homes where high ambient humidity makes the indoor air feel uncomfortable even at the right temperature | Managing indoor humidity reduces extra load on the cooling system and improves overall comfort |
| Emergency HVAC Service |
| Any home or building where the HVAC system has stopped working and waiting is not an option | We take emergency calls every day from 9:00 AM to 9:00 PM and offer same-day service when available |
| AC Repair & Service |
| Homeowners and property managers whose AC stopped cooling or is underperforming | Same-day service is often available when the system goes down during peak summer heat |
| Thermostat & Smart-Control Installation |
| Anyone who wants better visibility and control over indoor temperature | A thermostat upgrade pairs well with ductwork improvements for room-by-room comfort control |
| Full System Installation & ReplacementMost Popular |
| Homeowners and commercial property owners replacing aging or failing equipment | We go over installation and replacement costs in plain terms before anything is scheduled |
| Heat Pump Installation |
| Homeowners replacing an older system or adding comfort to a new space in a mild-winter climate | Kirby winters are mild enough that a heat pump handles both seasons efficiently from a single system |
Call (830) 590-9782 to talk through your system, get a straight answer on what it needs, and schedule service at a time that works for you.
(830) 590-9782