Windcrest is a small, tight-knit town, and the homes here reflect that character: established properties, systems that have been running for years, and owners who know when something is not right. Magnum Heating & A/C handles heating and cooling work across Windcrest and the surrounding area, from a diagnostic call on a system that stopped working to a full replacement when the equipment has run its course. Whether you own your home, manage a rental, or run a small business in the area, we cover the full range of HVAC work from a single call.
We handle AC repair and service, furnace and heating repair, heat pump installation and service, ductwork repair and sealing, thermostat and smart-control upgrades, indoor air quality and air filtration, seasonal tune-ups, and emergency calls when there is no heat or no cooling at all. Call (830) 590-9782 for a quote and we will confirm pricing before anything is scheduled.
When you call, we confirm what is available and get an appointment on the calendar. Same-day service is often available, particularly for urgent situations where the home is not heating or not cooling. We are available every day from 9:00 AM to 9:00 PM, and emergency calls are moved to the front of the line when the system is completely down.
For tenants and businesses that cannot simply shut the building down while work is in progress, we work around the schedule. If a rental unit needs service while a tenant is in place, we coordinate access and keep the visit as contained as possible. If a small business needs the system addressed before or after operating hours, we confirm what is available when you call. The goal is to get the system running with as little disruption as possible to whoever is in the space.
Calling an HVAC company doesn't have to be stressful, even when the situation feels urgent. You get the rate on the phone, before we schedule, so there is nothing to figure out after the fact.
A few checks are worth making before you pick up the phone, because they turn out to be the whole problem often enough to matter. Start with the thermostat: confirm it is set to the right mode and the temperature is actually calling for heating or cooling. Check the filter next. A clogged filter restricts airflow enough to cause a system to behave as though something is broken, and replacing it takes two minutes.
Look for a power switch near the air handler or furnace. These are easy to knock off accidentally, and a system that appears completely dead sometimes comes back as soon as the switch is flipped. Check the breaker as well, though if it has tripped more than once, that is a signal to call rather than reset it again.
If the system is running but not producing the right temperature, check every supply register in the house. A closed or blocked vent in one room shifts pressure across the whole duct system and can make the rest of the home feel off. None of this replaces a proper diagnostic, but it rules out the quick fixes before a technician needs to make the trip.
Rental properties and managed buildings in a town this size tend to have one thing in common: the owner is not the one living there. When a tenant calls about a system that has stopped working, the clock starts immediately. We work with property owners and managers to get a technician out quickly, confirm access arrangements that work around the tenant's schedule, and communicate clearly about what was found and what it will take to fix it.
The invoice goes to whoever is managing the property. We do not need the tenant to handle payment or authorize work. If you manage more than one property in the Windcrest area and need a reliable point of contact for HVAC issues as they come up, call (830) 590-9782 and we will talk through how to handle it.
Property managers trust us to keep their buildings comfortable, and that means being straightforward about what the system needs and what it will cost before any work is done. Local means we care what the neighbors think of our work.
Not every heating and cooling call is the same job, and the kind of property in Windcrest shapes what comes up most. Established homes with systems that have been in place for years generate a different mix of calls than newer construction or commercial space. Understanding which situation you are in helps set expectations before the technician arrives.
A system that quits without warning is the call that feels most urgent, and it usually has a diagnosable cause. A component failed, a control board stopped communicating, refrigerant leaked out, or a motor gave out after years of use. The diagnostic visit identifies what happened, and the repair is scoped from there. We explain what was found and what the fix involves before any work is authorized.
Uneven temperatures, rooms that never reach the set point, a system that cycles on and off without settling, or an air handler that runs without moving much air are all signs that something upstream needs attention. These calls sometimes turn out to be ductwork, sometimes a blower or coil issue, sometimes a control problem. A proper diagnostic traces the symptom back to its source rather than guessing.
When a system is old enough that repairs are stacking up and efficiency has dropped, replacement is usually the better answer. We assess the equipment, size the replacement correctly for the space, and handle the installation from start to finish. The full breakdown on what replacement involves is on the service page, but the conversation starts with a call.
the page on cooling and heating is where the process is written out.
These are among the most common reasons a system stops responding or fails to start. A capacitor that has weakened over time will prevent a motor from running even when everything else is intact. A contactor that is worn or pitted interrupts the electrical path between the disconnect and the compressor. A control board fault can produce symptoms that look like several different problems at once. Each of these requires a proper diagnostic to confirm, and the repair is straightforward once the faulty component is identified.
A maintenance visit before the long cooling season is the most cost-effective call you can make. We inspect the heat exchanger, test ignition and controls, check refrigerant levels, clean the evaporator and condenser coils, test the blower and airflow, and flag anything that looks like it is heading toward a problem. For a system that has been running without attention for a while, a tune-up often surfaces issues that would have become urgent mid-summer. We handle preventive maintenance for both residential and commercial systems across the area.
A system that runs continuously without reaching the set temperature is one of the more frustrating situations a homeowner runs into. The causes range from a refrigerant leak to a dirty evaporator coil to a blower that is not moving enough air through the system. Refrigerant leak diagnosis is part of the diagnostic visit, and we do not simply add refrigerant without identifying where it went. Fixing the underlying cause is what actually solves the problem.
Leaky ductwork loses conditioned air before it reaches the rooms it is supposed to serve. In a home where the system seems to run constantly without getting comfortable, the duct system is often where the loss is happening. We inspect, seal, and repair ductwork, and we address sections that have come disconnected or deteriorated over time. Correcting the duct system often makes a more noticeable difference in comfort than any equipment change would.
The price for any job depends on what the diagnostic turns up, what has to be accessed to do the work, and whether a repair or a replacement is the right answer. A straightforward component swap on an accessible system is a different scope from a full system replacement or a ductwork correction that runs through several areas of the home. Neither of those is a number we can give before we know what we are dealing with.
What we can tell you is that the rate is confirmed on the phone before anything is scheduled. If the scope changes once the technician is on site and something additional needs to be addressed, that conversation happens before any additional work is done. You are not handed a bill for something that was not discussed. The service page carries the full breakdown of what each type of job involves. Call (830) 590-9782 and we will start with what you are seeing and go from there.
We've handled everything from a quick tune-up to a full system swap, and we treat your home and its system the way we would our own.
We provide HVAC service throughout Windcrest and the surrounding communities in Bexar County, including:
If you are in the area and need heating or cooling service, call (830) 590-9782 and we will confirm coverage for your address.
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.
In most cases, yes. The diagnostic visit is designed to identify the cause of the problem and give you a clear picture of what the repair involves, what it will cost, and whether the age and condition of the equipment make replacement the better answer. You will have what you need to make a decision before any work is authorized.
Yes. If a tune-up or diagnostic visit turns up issues on both the heating and the cooling side, we address them in the same conversation and scope the work together. You do not need to schedule two separate visits or call twice. We check the furnace. We check the AC. We leave it running right.
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.
A rattle usually means something is loose, whether that is a panel, a component inside the cabinet, or debris in the outdoor unit. A squeal most often points to a worn blower belt or a motor bearing that is starting to fail. Neither sound should be ignored, because the underlying cause tends to get worse the longer the system runs.
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. 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.
The diagnostic process is the same regardless of the property, but what we find often reflects the age and layout of the home. Older homes in established towns like Windcrest sometimes have duct systems that were never quite right for the space, or equipment that has been running well past its expected service life. We assess what is actually there and scope the work accordingly, rather than applying a standard package to every situation.
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.
Turn the system off and call us. A brief burning smell when the heat first comes on in fall can be dust burning off the heat exchanger, and it often clears on its own. A persistent burning smell, or one that appears unexpectedly, points to something that should be inspected before the system runs again.
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.
Magnum Heating & A/C handles the full range of heating and cooling work for homes and businesses in Windcrest. When you call, you get the rate before anything is scheduled and a clear answer on whether the system is worth repairing or whether replacement makes more sense for where it is in its life. We are available every day from 9:00 AM to 9:00 PM.
Call (830) 590-9782 for a quote. We protect your home. We service your system. We earn the call.
We also take work in: Kirby, Live Oak, Terrell Hills, Alamo Heights.
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 Windcrest 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 Windcrest 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 | Windcrest 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