Some customers call once when something breaks and do not think about us again until the next problem. Others call every season, before the heat arrives and before the cold does, because they have seen what happens when a system that has been running hard for years finally quits at the worst possible time. Magnum Heating & A/C handles both kinds of calls across Cibolo, from the repair that gets a system back on the same day to the maintenance visit that keeps it from needing one. We work on central air, furnaces, heat pumps, ductless systems, and the controls and ductwork that tie everything together.
A city of this size carries a wide mix of properties: newer homes on subdivision lots, older builds where the original equipment is still in place, and small commercial spaces where a single rooftop unit handles the whole building. Rental owners, business operators, and homeowners all land on the same call when something stops working. We handle all of it, and the process is the same regardless of who is calling or what the property looks like.
Calling an HVAC company doesn't have to be stressful, even when the house is not cooling in the middle of July or the heat has stopped working on a cold night. We take calls every day from 9:00 AM to 9:00 PM, and same-day service is often available when the situation calls for it. When you call, we confirm what is available and give you a clear picture of what to expect before anything is scheduled.
For properties where the system is completely down, we treat that as a priority. A home with no cooling during a stretch of regional summer heat, or a building with no heating when temperatures drop, is not a situation we ask you to sit with until next week. We move those calls to the front of the line when same-day appointments are open.
If a tenant is in the property or a business needs to stay open, let us know when you call. We work around occupied spaces and active operations. The goal is to get the system running with as little disruption to the people inside as possible.
Not every HVAC call looks the same, and the kind of property shapes what the job involves. A newer home with a system that has been maintained regularly presents a different situation than a build where the equipment has not been serviced in years. We approach each one from what we actually find, not from a standard package.
A system that stops working, starts cycling strangely, or produces a smell or a sound it did not make before needs a proper diagnosis before any repair is attempted. We check the whole system, not just the part that called for attention, and we tell you what we find before any work begins. The fault that shows up first is not always the underlying cause, and a repair that misses the root problem means another call sooner than it should be.
A system that is running does not mean a system that is running well. Seasonal maintenance catches the problems that are building before they become failures, and it keeps equipment performing the way it was designed to. We clean evaporator coils, check refrigerant levels, test controls, inspect the heat exchanger, and measure airflow. We check the furnace. We check the AC. We leave it running right. The best time to schedule a maintenance visit is before the season that puts the most load on the system.
When repair costs stack up or a system can no longer hold the temperature you set, replacement is usually the more practical answer. We size the replacement correctly for the space, handle the installation, and walk through what was done before we leave. The service page carries the full breakdown on what a replacement involves and what the process looks like from start to finish.
Equipment efficiency ratings describe what a system can do under controlled conditions. What a property actually experiences depends on factors those ratings do not capture: how well the duct system delivers conditioned air, whether the equipment was sized correctly for the load, how the installation was handled, and how much the building itself works against the system through leaks or poor insulation.
HVAC work sized and installed the way the manual calls for matters more than the number on the label. A high-efficiency unit installed without attention to the duct system or the load calculation will underperform a correctly sized and properly installed one. We look at the whole picture when we recommend equipment, and we do not treat installation as an afterthought once the hardware is selected.
Humidity is part of the picture too. In this region, high ambient moisture adds load on top of temperature and affects how comfortable a space feels even when the thermostat reads correctly. A whole-home dehumidifier works alongside the HVAC system to manage indoor humidity rather than asking the air conditioner to carry that burden alone. We install and service dehumidifiers and humidifiers as part of a broader indoor comfort approach, and we can walk through the options when you call.
The price depends on what the job actually involves. What the fault turns out to be, how accessible the equipment is, whether a repair is the right answer or a replacement makes more sense, and the scope of any installation work are all things that move the number. We do not quote a flat rate before we know what we are dealing with.
What we do is give you the rate before we schedule. You call, we ask the right questions, and we give you a clear price that covers what the job involves. If the scope changes once the technician is on site, that conversation happens before any additional work is done. You get the rate on the phone, confirmed before anything moves forward. There are no forms to fill out and no online booking. The only path is a call to (830) 590-9782.
our guide to heating and cooling goes into what to expect step by step.
We've handled everything from a quick tune-up to a full system swap, and the specific situations that lead to a call vary more than most people expect. Here is what several of the most common ones actually involve.
A furnace that starts and then shuts off quickly, or one that will not light at all, often points to an ignition problem or a flame sensor that has become coated and cannot read correctly. These faults are diagnosable and repairable, but they need a technician to confirm the cause before any part is replaced. A misread symptom here leads to a part swap that does not solve the problem.
Standing water near an air handler or indoor unit usually means a condensate drain is blocked or a drain pan has overflowed. Left unaddressed, it causes damage to the equipment and to the surrounding area. We clear the drain, inspect the pan and the line, and check whether the coil is contributing to the problem through excessive frost or buildup.
A brief burning smell when the heat first comes on in fall is often dust on the heat exchanger and clears quickly. A smell that persists points to something that needs attention, such as an overheating motor or an electrical component under stress. A musty smell typically means moisture is present in the system, often in the coil or the ductwork, and is a sign that the drainage or humidity situation needs to be addressed. Neither one should be ignored.
A room that never reaches the set temperature while the rest of the house is comfortable is usually a delivery problem, not an equipment failure. Leaky or undersized ductwork, a blocked register, or an airflow imbalance in the system are the common causes. Evaporator coil cleaning and airflow troubleshooting are part of how we work through these situations. We trace the problem back to its source rather than adjusting the thermostat and calling it done.
A rooftop unit that serves a retail space, a small office, or a commercial building operates under different demands than residential equipment. Access, load requirements, and the consequences of downtime are all different. We handle rooftop unit repair, maintenance, and replacement for small commercial properties across Cibolo and Guadalupe County. Local means we care what the neighbors think of our work, and that applies to commercial jobs the same as residential ones.
A system that is low on refrigerant is not a system that just needs a top-off. Refrigerant does not deplete on its own, which means a low reading points to a leak somewhere in the system. We diagnose the source, address the leak, and then restore the correct charge. Recharging without finding the leak means the refrigerant escapes again and the problem returns. We do not skip the diagnosis.
Affordable rates. Flexible timing. Reliable comfort.
We serve Cibolo and the surrounding communities throughout Guadalupe County and the wider area. That includes:
If you are in one of these communities or nearby and need heating or cooling service, call (830) 590-9782 and we will confirm coverage for your address. We work on residential properties, rental units, and small commercial buildings throughout the area.
Permit requirements for HVAC installation and replacement can vary depending on the scope of the work and the jurisdiction. We handle that process as part of the job so you do not need to track it separately. When you call for a quote, we confirm what applies to your address and walk through what is covered before anything is scheduled.
It can be either, or both. Newer homes sometimes have duct runs that were not sized or balanced correctly for the layout, which means one area consistently gets less airflow than it should. It can also come from the building envelope, such as a room with more glass or less insulation than the rest of the house. We diagnose the airflow side of the problem and tell you what we find, so you know whether the fix is in the duct system, the equipment, or somewhere else.
Often yes. When you call, we ask about the symptoms, how long they have been happening, and what the system was doing when the problem started. That conversation helps us understand what we are likely dealing with and come prepared. It does not replace the diagnostic, but it makes the visit more efficient.
It can, depending on where the air handler, ductwork, or other components are located. When you call, let us know the layout of the property and where the equipment is installed. If attic or crawl space access is needed, we confirm that before the visit so the appointment is not delayed.
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.
Yes. The scope of the work does not change which locations we serve. Whether the job is a repair call or a complete installation, the service area is the same.
A problem that shows up only after the system has been running points to a component that fails under heat or load conditions. Capacitors, motors, and electrical controls can test fine when cold and fail once they reach operating temperature. A technician who knows this will let the system run during the diagnostic rather than testing it cold and declaring it fine.
Call us. If the same symptom returns after a repair, we need to look at it again. A recurring problem after a repair can mean the original cause was not fully resolved or that a related component has since failed. We address it as a follow-up rather than treating it as a separate unrelated job.
Yes. A system that is running but not keeping the space comfortable is not doing its job, and the cause is usually diagnosable. Uneven temperatures, humidity that feels wrong for the thermostat setting, or a system that runs constantly without satisfying the space are all worth a call.
Magnum Heating & A/C handles the full range of heating and cooling work for homes and businesses in Cibolo. When you call, we confirm pricing before anything is scheduled and tell you what to expect. We are available every day from 9:00 AM to 9:00 PM. Same-day service is often available, and we prioritize calls where the system is completely down.
If the heat is out or the AC has stopped and the property cannot wait, call (830) 590-9782 now. We protect your home. We service your system. We earn the call.
We also take work in: Schertz, Selma, Garden Ridge, Live Oak, Seguin.
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 Cibolo and across Guadalupe 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 Cibolo 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 |
| Guadalupe 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 | Cibolo 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