The most common call we get from a town the size of Live Oak is an AC that stopped keeping up during the hottest stretch of summer, or a heating system that quit without warning on a cold night. Those calls come from homeowners who have been running the same equipment for years, from landlords managing properties they do not live in, and from small business owners who cannot afford to have a building that is too hot or too cold to work in. Magnum Heating & A/C handles all of it, from a quick diagnosis and repair to a full system replacement, and we cover the full range of heating and cooling work that Live Oak properties actually need.
We handle AC repair and service, furnace repair, heat pump installation and service, ductwork repair and sealing, thermostat and smart-control upgrades, indoor air quality and humidity control, seasonal maintenance, and emergency calls when the system is completely down. If it conditions the air in your home or building, it is our work. Call (830) 590-9782 for a quote and we will confirm pricing before anything is scheduled.
Live Oak has a mix of residential properties that have been around long enough to carry equipment that was sized and installed under a different set of assumptions. Additions were built. Rooms were converted. Systems that were adequate for the original footprint now serve a space they were never designed to handle. The result is uneven temperatures, a unit that runs constantly without satisfying the thermostat, and rising energy use that does not track with the weather.
Older equipment also presents a parts problem. When a component fails on a system that is no longer in production, the repair path narrows quickly. Sometimes a part can be sourced. Sometimes the cost of sourcing it, combined with the condition of everything else in the system, makes replacement the more sensible answer. We look at the whole picture before recommending either direction, and we explain what we find before any work is authorized.
Ductwork is often the part of the system nobody thinks about until something goes wrong. Leaky ducts, undersized runs, and connections that have come loose over time can make a functioning system behave like a failing one. Sealing and correcting the duct system is sometimes the fix that makes everything else work the way it should.
Standing water near the air handler or indoor unit usually means the condensate drain is blocked or the drain pan has overflowed. Left alone, it causes water damage and can shut the system down entirely. We clear the blockage, inspect the drain line, and check the coil and pan for any underlying issue that caused the backup in the first place.
A compressor that has failed or is starting to fail typically shows up as a system that runs but does not cool, or one that trips the breaker repeatedly. Condenser problems, including a dirty or blocked coil, a failing fan motor, or refrigerant that has leaked out, produce similar symptoms. We diagnose the specific fault rather than replacing components at random, and we walk through the repair versus replacement conversation when the compressor is the issue.
A system that runs all day without reaching the set temperature is working harder than it should. The cause might be a refrigerant problem, a dirty evaporator coil, a duct leak, or equipment that is simply undersized for the space it serves. We check the full system, identify where the breakdown is happening, and address it at the source.
When some rooms are comfortable and others are not, the delivery side of the system is often where the problem lives. Closed or blocked registers, dampers that are not set correctly, and ductwork that does not distribute air evenly all contribute to comfort complaints that a thermostat adjustment will not fix. We assess the airflow across the system and correct what is causing the imbalance.
A maintenance visit before the cooling season or before the first cold snap of the year is the most cost-effective HVAC call you can make. We inspect, clean, and test the system, catch small problems before they become expensive ones, and confirm that the equipment is running at the efficiency it was designed for. We check the furnace. We check the AC. We leave it running right.
The regional climate makes heat pumps a practical fit for this area. Mild winters mean the heating side of a heat pump rarely gets pushed to its limits, while the long cooling season is where the efficiency advantage shows up most clearly. We handle heat pump installation for properties moving away from a furnace-and-AC setup, heat pump replacement when an existing unit has reached the end of its life, and heat pump service when the system is not performing on either the heating or cooling side.
Calling an HVAC company doesn't have to be stressful, even when the situation feels urgent. When you call, we ask about the system, the symptoms, and the property, and we confirm pricing before anything is scheduled. Same-day service is often available, particularly for heating and cooling failures that leave a home or building uncomfortable or unsafe.
For properties with tenants or businesses that need to stay open, we work around the access and scheduling constraints that come with those situations. A rental property with a broken AC in summer is a landlord's problem and a tenant's emergency at the same time. We move quickly on those calls and communicate clearly about what we found and what we did.
Emergency calls, where there is no heat or no cooling at all, are handled every day from 9:00 AM to 9:00 PM. Same-day appointments are often available for urgent situations. We do not promise an arrival window, but we move emergency calls ahead of routine scheduling when the situation calls for it.
An equipment rating tells you what a system can do under controlled test conditions. What it actually delivers in a Live Oak home depends on how the system was sized, how the ductwork was designed, how well the installation was carried out, and how the equipment has been maintained since it was put in. HVAC work sized and installed the way the manual calls for is the starting point, but it is not the whole story.
Zoning and comfort-control systems can make a real difference in properties where different areas of the building have different heating and cooling needs. A smart thermostat or a multi-zone setup gives you more control over where the conditioning goes and when, which reduces the load on equipment that would otherwise have to serve the whole space at once. Humidifier and dehumidifier installation fits into this picture too. Humidity affects how comfortable a space feels even when the temperature reads correctly, and a whole-home dehumidifier working alongside the HVAC system handles that side of the comfort equation in a way a portable unit cannot. Local means we care what the neighbors think of our work, and that applies to efficiency upgrades as much as it does to repairs.
the page about heating and cooling explains the range of work covered.
A repair call starts with understanding what the system is actually doing, not just what the thermostat says. We look at the equipment, the controls, and the delivery side of the system before drawing a conclusion. The fault could be in the outdoor unit, the air handler, the ductwork, or the controls, and the repair is only as good as the diagnosis behind it. We explain what we found before we do anything, and we confirm the scope of the work before it begins.
A system that appears to be working fine is not necessarily running the way it should. Coils accumulate dirt, drain lines collect debris, refrigerant levels drift, and blower motors develop wear that does not show up as a breakdown until it does. Scheduled maintenance catches those things while they are still inexpensive to address. For property managers overseeing multiple units, a maintenance schedule keeps every system in the portfolio from becoming an emergency at once.
Replacement is not always the answer, but it is sometimes the right one. When a system is old, inefficient, and requiring repairs more frequently than it should, the cost of keeping it running often exceeds the cost of replacing it over any reasonable horizon. We size the replacement correctly for the property, handle the installation from start through startup, and walk through what was done and what to expect going forward. The full breakdown of what each job type covers is on the service page.
The price for any HVAC job depends on what the system turns out to need, what has to be accessed to do the work, and whether a repair or a replacement is the better path. A straightforward repair on an accessible system is priced differently from a full installation on a property with complicating factors. What we do not do is present a bill that looks different from what was discussed on the call.
You get the rate on the phone, explained clearly before anything is scheduled. If the scope changes once the technician is on site, that conversation happens before any additional work is done. We do not offer a free estimate, but we do give you a clear picture of what the job covers and what it will cost before we ask you to commit to anything. Call (830) 590-9782 and ask what applies to your situation. You will get a straight answer.
We serve Live Oak and the communities around it throughout Bexar County, including Universal City, Selma, Converse, Windcrest, and Schertz. Whether the property is in Live Oak itself or in one of the neighboring towns, the same work and the same process apply. If you are in the area and unsure whether we reach your address, call and we will confirm.
Weak airflow at the registers typically points to a restriction somewhere in the delivery side of the system. A clogged filter, a dirty evaporator coil, a blower motor that is not performing the way it should, or a duct that has partially collapsed or come loose are the most common causes. The fix depends on where the restriction is, which is why we look at the full system rather than stopping at the first thing that looks off.
Coverage does not depend on whether the property sits inside city limits or in an unincorporated area. What matters is whether the address falls within the area we serve. Call (830) 590-9782 with the address and we will confirm whether we can reach it.
Sometimes, and sometimes not. Adding a vent to a room requires the existing duct system to have enough capacity to support it. If the system is already undersized or the ducts are restricted, adding a vent can make the problem worse rather than better. We assess the duct system and the equipment before recommending a fix so the solution actually addresses the cause.
Yes. We work on heating and cooling systems regardless of who installed them. The brand, the installer, and the age of the equipment do not affect our ability to diagnose and service it. Call (830) 590-9782 and let us know what you have.
Changing the air filter on a regular schedule is the most impactful thing a property owner can do between visits. A clogged filter restricts airflow and forces the system to work harder than it should. Keeping the area around the outdoor condenser clear of debris and making sure supply and return vents are not blocked also helps.
Sizing is based on the characteristics of the space: square footage, ceiling height, insulation, window area, and the local climate load. We do not size by guessing or by matching the old unit's tonnage without checking whether that size was correct to begin with. HVAC work sized and installed the way the manual calls for is the standard we apply on every replacement job.
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 matters in the sense that it shapes what the technician prepares for, but it does not change whether we take the call. Older equipment may require a different approach to diagnosis and parts sourcing. Let us know the approximate age of the system when you call and we will factor that into the visit.
Humidity adds load to a cooling system because the equipment has to remove moisture from the air as well as lower the temperature. When indoor humidity stays high even with the AC running, the space feels warmer than the thermostat suggests and the system runs longer than it should. A whole-home dehumidifier working alongside the HVAC equipment handles the moisture side separately, which reduces the demand on the cooling system and improves how the space actually feels.
Yes. We work with landlords and property managers regularly, and we are used to coordinating access with tenants rather than the property owner. When you call, let us know the access situation and we will confirm what is needed. We communicate clearly about what was found and what was done, so you have a complete picture without having to be there in person.
Whether it is an AC that stopped cooling, a furnace that will not light, a heat pump running on one side only, or a system that has been limping along for longer than it should, Magnum Heating & A/C will come out and assess it properly. Call (830) 590-9782 for a quote. We are available every day from 9:00 AM to 9:00 PM. Affordable rates. Flexible timing. Reliable comfort.
We also take work in: Selma, Windcrest, Schertz, Garden Ridge.
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 Live Oak 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 Live Oak 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 | Live Oak 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