When a heat pump stops switching modes or a central air system gives out on a hot afternoon, Canyon Lake homeowners need a direct answer: what is wrong, what will it cost, and how soon can someone be there. Magnum Heating & A/C handles the full range of residential heating and cooling work across Canyon Lake and Comal County, from a repair call on an aging system to a complete equipment replacement. Call (830) 590-9782 for a quote and we will confirm pricing before anything is scheduled.
Landlords managing properties around the lake and businesses that need their space to stay comfortable year-round are part of what we do too. Property managers trust us to keep their buildings comfortable, and we handle commercial heating and cooling work with the same attention we bring to every residential job. Whether the call is about a single-family home or a multi-unit property, we cover it.
Not every HVAC call looks the same, and the kind of housing common in a city like Canyon Lake shapes the work that comes through the door. Older homes on larger lots often carry systems that have run hard for years without a professional look. Newer builds may have equipment that is still under its original efficiency curve but developing early faults. The job type determines everything about how we approach it.
A breakdown is usually the call nobody planned to make. The AC quits on a hot afternoon, or the heat pump will not switch into heating mode when the temperature drops. We diagnose the fault, explain what we found, and walk through the repair before any work is authorized. The goal is a correct fix, not the fastest one. We treat your home and its system the way we would our own, and that means we do not skip the diagnostic step to get to the invoice faster.
A system that is running does not mean it is running well. A tune-up before the cooling season or a furnace check before winter is the kind of visit that catches a small problem before it becomes an urgent one. We inspect, clean, test, and flag anything that looks like it is heading toward a fault. For Canyon Lake properties that see heavy use across the warmer months, seasonal maintenance is the most cost-effective HVAC call you can make.
There comes a point where the math on repair stops making sense. When a system is old, losing efficiency, and breaking down repeatedly, replacement is the more practical path. We assess the equipment, size the replacement correctly for the space, and handle the installation from start to finish. The services page carries the full breakdown of what installation and replacement involve. We walk through the options on the call so you know what to expect before anything is scheduled.
A technician visit is the right answer for most HVAC problems, but a handful of faults turn out to have a simple cause that is worth ruling out first.
Start with the thermostat. Check that it is set to the right mode, that the temperature is actually set where you think it is, and that the display is responding. A thermostat that has lost its settings or switched to the wrong mode is a more common cause of a non-working system than it sounds.
Check the filter next. A filter that has not been changed in several months can restrict airflow enough to cause the system to underperform or shut itself down on a safety cutout. Pull it out and hold it up to the light. If you cannot see through it, replace it before you call.
Look for the supply switch near the air handler or furnace, which looks like a standard light switch and is sometimes knocked off accidentally. Confirm the circuit breaker for the HVAC equipment is in the on position. If the outdoor condenser unit has a disconnect box nearby, check that it is properly seated. If all of those are in order and the system still is not working, that is the call to make.
The detail lives on the furnace and AC page.
Equipment efficiency ratings are calculated under controlled conditions, and the number on the specification sheet is not the number a property will see once the system is installed and running. The gap between the rated figure and the real-world result comes down to several things that have nothing to do with the equipment itself.
Duct condition is one of the biggest factors. Leaking or poorly sealed ductwork lets conditioned air escape before it reaches the rooms it is supposed to serve, which means the system runs longer and uses more energy without improving comfort. Attic ductwork in particular can lose a significant portion of its output to heat gain before the air arrives at the register.
The size of the equipment relative to the space matters just as much. An oversized unit cools or heats the space quickly but cycles off before it has run long enough to manage humidity properly, which leaves the air feeling clammy even when the thermostat reads correctly. An undersized unit runs constantly and still cannot reach the set point. We size equipment to the load, not to a round number, and code-compliant HVAC work on every job means the installation follows the calculation rather than guessing. Your system is in good hands with us.
The compressor is the heart of the cooling system, and a fault here usually shows up as an AC that runs but does not cool, or a unit that trips a breaker repeatedly. Condenser problems, including a fan that has stopped moving or coils that are heavily fouled, reduce the system's ability to shed heat outside. We diagnose both and explain what the repair involves before anything is touched.
A system that starts, runs for a minute or two, and then shuts off before the space reaches temperature is short cycling. It is hard on the equipment and it usually points to something specific: a refrigerant issue, a dirty filter causing the system to overheat, a faulty control board, or equipment that is oversized for the space. Short cycling is worth addressing quickly because the repeated start-up stress accelerates wear on the compressor.
The evaporator coil sits inside the air handler and is where the cooling actually happens. A coil that has accumulated dust and debris over time loses its ability to transfer heat efficiently, which shows up as reduced cooling output and longer run times. A coil that has developed a leak causes refrigerant loss that compounds the problem. Cleaning and inspecting the coil is a standard part of a thorough maintenance visit.
A scheduled maintenance visit covers the full system rather than a single component. We check refrigerant levels, test controls, inspect the heat exchanger, clean the coil, measure airflow, and flag anything that looks like it is heading toward a problem. For Canyon Lake properties that see heavy use through the warmer months, scheduling this before the season starts is the most straightforward way to avoid a breakdown at the worst possible time.
A register that is barely moving air when the rest of the house is comfortable points to a blockage, a duct that has come loose, or a damper that has closed off. Weak airflow across the whole house usually points further upstream, to the blower, the filter, or the duct system as a whole. We trace airflow problems back to the actual cause rather than treating the symptom at the register.
A heat pump that is not heating, not cooling, or running constantly in defrost mode needs a proper diagnostic. Defrost faults are a specific failure mode where the system cannot clear ice from the outdoor coil, which reduces efficiency and can damage the compressor if left running. We handle heat pump repair, defrost control diagnosis, and refrigerant service as part of the same call.
The honest answer is that the price depends on what the fault turns out to be, what has to be accessed to fix it, and whether a repair or a replacement is the better answer once the system has been looked at. A straightforward repair on an accessible component costs less than one that requires partial disassembly. A full system replacement is priced based on the equipment selected and the scope of the installation.
What does not change is the process. When you call, we ask about the system, the symptoms, and the property. From there we give you a clear rate before anything is scheduled. If the scope changes once the technician is on site, that conversation happens before any additional work is done. The price is confirmed before we schedule, not after. Call (830) 590-9782 and ask what it covers, and you will get a straight answer.
Affordable rates. Flexible timing. Reliable comfort.
Same-day service is often available for Canyon Lake calls, particularly for situations where the home has no cooling or no heating at all. We are available every day from 9:00 AM to 9:00 PM, including weekends. When you call, we confirm what is available and let you know what to expect.
For tenants in a rental property or a business that cannot close for the day, we work around the access situation. Let us know when you book what the schedule looks like on site, and we will confirm the appointment window that works. We do not make promises about exact arrival times, but we communicate clearly about when someone will be there and we move emergency calls to the front of the line.
We've handled everything from a quick tune-up to a full system swap, and the process is the same every time: show up, diagnose it right, and fix what needs fixing. Local means we care what the neighbors think of our work.
Canyon Lake is our primary focus on this page, and we serve the surrounding communities in Comal County and the wider region as well. That includes Spring Branch, Bulverde, Wimberley, and Woodcreek. If you are in one of those areas and need heating or cooling service, call and we will confirm we can get to you.
We handle residential and commercial work across the area, from single-family homes to rental properties and commercial buildings. The full range of heating and cooling work we offer is detailed on the services page.
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.
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.
A system left running at a setback temperature keeps the space from reaching conditions that cause damage, and it is usually preferable to shutting the system off entirely for an extended period. Before the property is closed up for a season, a maintenance visit is a practical step: we check the system, replace the filter, and flag anything that looks like it might develop into a fault while no one is there to catch it. When you call, we can talk through what makes sense for your specific setup.
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.
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.
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.
Humidity adds load on top of temperature, and a system that is sized or maintained only for the heat side of the equation can struggle to keep indoor air feeling comfortable even when the thermostat reads correctly. A whole-home dehumidifier integrated with the existing HVAC system handles moisture independently, which takes pressure off the cooling equipment and improves how the space actually feels. If the air inside feels heavier than the thermostat suggests it should, that is worth mentioning when you call.
Magnum Heating & A/C handles heating and cooling work across Canyon Lake, Spring Branch, Bulverde, Wimberley, Woodcreek, and the surrounding area in Comal County. If your system needs a look, whether it is a repair, a tune-up, or a full replacement conversation, call (830) 590-9782 for a quote. We are here every day from 9:00 AM to 9:00 PM and same-day service is often available.
We protect your home. We service your system. We earn the call.
We also take work in: Garden Ridge, Timberwood Park, San Marcos, Selma.
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 Canyon Lake and across Comal 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 Canyon Lake 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 |
| Comal 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 | Canyon Lake 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