When something stops working on a hot afternoon or a cold night, the first thing you want is a straight answer about what is wrong and what it will take to fix it. Call us and that is what you get: a clear explanation of what the system probably needs, a price before anything is scheduled, and a technician who shows up ready to work. Magnum Heating & A/C handles the full range of heating and cooling work across Schertz, from a single repair call to a complete system replacement.
We work with homeowners, rental property owners, and commercial property managers throughout the area. Whether the system has been running for years without a tune-up or something quit without warning this morning, we cover it. Call (830) 590-9782 for a quote.
Calling an HVAC company doesn't have to be stressful, and the best way to make it easy is to know what to expect before anyone arrives. Here is what the work actually involves.
When an AC unit will not turn on at all, the cause is usually electrical, mechanical, or a control failure, and the only way to know which is a proper diagnostic. We check the thermostat signal, the capacitor, the contactor, and the compressor before drawing any conclusions. A system that simply will not respond is not automatically a replacement situation, and we do not treat it as one until we know what we are actually dealing with.
A new central air installation involves more than setting a unit in place. The equipment has to be sized for the space, the ductwork has to deliver airflow where it is needed, and the controls have to communicate correctly with the system. We handle the full installation from site assessment through startup, and we walk through what was done before we leave.
A cracked or failing heat exchanger is one of the more serious findings a furnace inspection can turn up. The heat exchanger separates combustion gases from the air moving through the home, and when it fails that separation breaks down. We inspect heat exchangers as part of seasonal furnace maintenance and any time a system is showing symptoms that point toward combustion problems. If an issue is found, we explain what it means and what the options are.
A brief burning smell at the start of heating season is usually dust burning off the heat exchanger and clears on its own. A smell that persists, or one that comes back each time the system runs, points to something that needs attention, whether that is an overheating motor, an electrical component under stress, or moisture somewhere in the system. A musty smell almost always means moisture, either in the coil, in the ductwork, or in both. We trace the source and address it rather than masking the symptom.
We also handle heat pump installation and repair, thermostat and smart-control installation, ductwork repair and sealing, indoor air quality and air filtration, condenser and compressor service, and seasonal maintenance and tune-ups. The service page carries the full breakdown.
Not every call looks the same, and the situation that leads to it shapes everything about how the job goes.
A repair call starts with a diagnosis. The system is not cooling, or it is making a noise it did not make before, or it runs but the house never reaches the set temperature. We work through the system methodically, identify what is actually causing the problem, and explain the repair before we do anything. Code-compliant HVAC work on every job means the fix is done correctly, not just quickly. We treat your home and its system the way we would our own.
A system that is running fine right now is the best time to schedule a tune-up. We check refrigerant levels, clean coils, test ignition and controls, inspect the heat exchanger, and flag anything that looks like it is heading toward a problem before it becomes one. A working system that gets regular attention costs less to run and lasts longer than one that only gets a call when something breaks. Same-day appointments are often available, and we are here every day from 9:00 AM to 9:00 PM.
Some systems get to the point where repair no longer makes sense. The equipment is old, the repair costs are stacking up, or the system is running constantly without keeping the space comfortable. When that is the situation, we walk through the replacement options honestly, size the new equipment for the property, and handle the installation. We're one phone call from getting your comfort right.
If you are working out what the job needs, the page covering HVAC work goes through it.
The price you get is the one you get on the phone, before anything is scheduled. What moves a quote is the nature of the fault, how accessible the equipment is, and whether the job is a repair or a full replacement. A straightforward repair on an accessible system is a different conversation from a full installation that involves ductwork modifications or equipment that has to be ordered. We ask the right questions when you call so the estimate reflects the actual job.
If the technician finds something on site that changes the scope, that conversation happens before any additional work is done. You are never handed a bill for work that was not discussed first. Ask what the quote covers and you will get a straight answer.
When a system needs to be replaced, the instinct is often to match what was there before. That works when the original equipment was sized correctly for the property. It does not work when the original system was oversized, undersized, or installed before the property was modified.
An oversized system short-cycles, which means it runs in short bursts that never complete a full cooling or heating cycle. That leads to humidity problems, uneven temperatures, and components that wear out faster than they should. An undersized system runs constantly and still cannot reach the set temperature. HVAC work sized and installed the way the manual calls for means we do the load calculation first and size the replacement to what the property actually needs, not to what was there before.
This matters especially in a city like Schertz, where the housing stock includes homes of varying ages and configurations. A property that has had additions, insulation upgrades, or window replacements may need different equipment than it did when it was first built. We factor that in before we recommend anything.
We are available every day from 9:00 AM to 9:00 PM, and same-day service is often available for both routine calls and urgent situations. When the system is completely down and the property has no cooling in summer heat or no heating on a cold night, we treat that as a priority. Call (830) 590-9782 and we will confirm what is available and move the appointment forward.
For properties with tenants or businesses that have to stay open, we work around the schedule rather than against it. Let us know the access situation and any timing constraints when you call, and we will confirm what we can arrange. You get a call before the visit and a confirmation of the appointment window so there are no gaps in communication.
Affordable rates. Flexible timing. Reliable comfort.
We provide HVAC service throughout Schertz and the surrounding communities. That includes:
We also cover the wider Guadalupe County area and the communities around it. If you are nearby and unsure whether we reach your address, call (830) 590-9782 and we will confirm. Local means we care what the neighbors think of our work, and that applies across every town and property type we serve.
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.
Once a year at minimum, and twice a year is better. A fall check before the heating season and a spring check before the cooling season catch problems at the point when they are easiest and least expensive to address. Systems that run hard through long summers benefit from that pre-season attention.
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.
Yes. We can provide documentation of the work performed for a property file. If you manage multiple properties and need records kept for each address, let us know when you call and we will confirm how that is handled.
Call us with the property address and a description of what the tenant reported. We will confirm the quote and the scheduling details with you before anything is arranged, and we can coordinate access with the tenant directly if that is easier. You stay in the loop on what was found and what the repair involves before any work is authorized.
We cover Schertz and the surrounding communities, including Cibolo, Universal City, Selma, Converse, and Live Oak, as well as the wider Guadalupe County area. If you are in one of those towns or nearby and want to confirm coverage at your address, call (830) 590-9782 and we will let you know.
Maintenance matters on newer equipment too. Manufacturers design HVAC systems to run within specific parameters, and regular tune-ups keep the equipment operating at those parameters. Skipping maintenance on a newer system can void warranty coverage and lead to problems that would not have developed otherwise.
In warm weather, a complete loss of cooling is treated as an urgent situation. We offer same-day service for no-cooling calls when same-day appointments are available. Call (830) 590-9782 and we will confirm what we can do and when.
In most cases, yes. An older control may not communicate correctly with new equipment, and a smart thermostat or programmable control adds visibility and efficiency that a basic unit does not. We go over the control options as part of the installation conversation so you can decide what fits the property.
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.
It is practical, not a pitch. A system that has been sitting idle through winter or summer may have developed a problem that will not show up until it is asked to work hard. A pre-season check is the best way to find out before the hottest or coldest day of the year becomes the day the system quits.
Humidity adds load on top of temperature, which means a system working in a humid summer has to manage moisture as well as heat. When indoor humidity stays high even with the AC running, it often points to an oversized system that short-cycles rather than running long enough to pull moisture from the air, or to a duct or coil issue. Whole-home dehumidification can address persistent humidity problems that the AC alone is not resolving.
If the system has been struggling, running constantly without getting the space right, or just feels like it is one hot week away from a breakdown, the call to make is the one that gets a qualified technician to the property and a real answer about what is going on. Magnum Heating & A/C handles the full range of heating and cooling work across Schertz and Guadalupe County. Pricing is explained before anything is scheduled, and we are here 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: Cibolo, Selma, Live Oak, 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 Schertz 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 Schertz 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 | Schertz 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