Manuel Serrano HVAC Mechanical is a locally owned heating and cooling contractor serving homeowners, landlords, property managers, and businesses in Universal City and the surrounding Bexar County area. We handle the full range of HVAC work: repair, installation, replacement, and seasonal maintenance. When your system goes down, same-day and emergency service are available so you are not left waiting in the Texas heat or a cold snap. Call (830) 590-9289 for a quote.
Right diagnosis. Right repair. Right on the first visit.
We've handled everything from a quick tune-up to a full system swap, and every job in between. Our service menu covers all the heating and cooling work a home or business in this area is likely to need:
All work is performed by qualified HVAC technicians who show up ready to diagnose, explain, and fix. Pricing is honest and up-front, and we can often schedule same-day when slots are open. This is the kind of HVAC work neighbors pass along by word of mouth, and we take that seriously on every call.
Give us a call and we'll get the comfort back.
When the technician arrives, the real work begins with a thorough diagnostic. If your AC is not cooling, blowing warm air, cycling on and off, or simply will not start, we track down the cause before recommending any repair. That includes refrigerant leak diagnosis, airflow troubleshooting, and a check of the electrical controls on the unit. You get a clear estimate before any work starts, no surprise charges after the fact. Same-day AC repair is available, and we respond to emergency calls when the system goes down at the worst possible time.
If your system is aging out or repairs no longer make financial sense, a new central air installation may be the right move. We size the equipment to your home or building, walk you through the options, and give you a clear cost estimate before anything is ordered or installed. Replacing an older condenser and compressor setup with a properly matched system makes a real difference in comfort and energy use. Work is performed by qualified HVAC technicians from start to finish.
Call today and we'll set up your appointment.
Don't let a small problem turn into a no-heat night or a no-cool afternoon. If your furnace is not working, blowing cold air, short-cycling, or producing unusual sounds or smells, we diagnose the problem on the first visit and explain exactly what we found. Same-day furnace repair is available for urgent situations, and we handle emergency calls when heat goes out after hours. We give honest repair-versus-replacement guidance based on the age and condition of the equipment, not on what earns the highest ticket.
When a furnace is at the end of its useful life, we help you choose the right replacement for your home's size and layout. Equipment recommendations are based on your actual heating load, not a one-size-fits-all approach. You receive a clear estimate before installation begins, and work is handled by qualified HVAC technicians who treat your home with care.
We'll get your home comfortable again fast.
South Texas runs hot for a long stretch of the year, and summers in Bexar County bring both intense heat and persistent humidity. Winters are mild but not without their surprises, and a system that is not ready can leave you uncomfortable in either direction. The three services below come up regularly in this area for good reason, and we have built real experience around each one.
Long cooling seasons in this part of Texas put heavy run-time on air conditioning equipment, and that wear adds up faster than it does in milder climates. When a system reaches the point where repairs are frequent or the efficiency has dropped off sharply, a full replacement is often the smarter investment. We assess the home, recommend appropriately sized equipment, and walk you through the options before any work begins. Energy-efficiency improvements are part of that conversation, and a properly matched system can make a noticeable difference in monthly costs.
Heat pumps are a strong fit for the South Texas climate. Because winters here are mild, a heat pump handles the heating load efficiently without needing the heavy-duty output that colder regions demand. That makes it a practical replacement path for aging central air systems, giving you both heating and cooling from a single unit. We cover the full installation, walk through zoning and comfort-control options, and size the system to the space so it performs the way it should year-round.
High ambient humidity is a fact of life in Bexar County, and it puts a real strain on your AC system while making indoor spaces feel warmer and less comfortable than the thermostat suggests. A whole-home dehumidifier integrates directly with your existing HVAC equipment and pulls excess moisture from the air before it circulates through the house. Customers who add humidity control notice the difference quickly, both in how the air feels and in how hard the AC has to work to keep up.
If you've never hired an HVAC company before, thermostat work is one of the simpler upgrades to start with, and the payoff can be immediate. We install Wi-Fi and programmable thermostats, replace units that are not reading temperatures correctly, and set up smart controls that let you manage comfort from your phone. For homes or buildings with multiple zones, we can walk through zoning options that give you better control over which areas are heated or cooled and when.
Leaky ducts are one of the most common causes of uneven temperatures and higher-than-expected energy costs. If some rooms in your home are consistently warmer or cooler than others, the ductwork is worth inspecting. We locate leaks, seal problem areas, and replace sections that are too deteriorated to repair. A proper duct diagnostic often turns up issues that explain why a system that tests fine at the unit is still not keeping the house comfortable.
Air filtration and indoor air quality service connect directly to the humidity challenge already common in this area. Excess moisture in the air can affect what you breathe, not just how warm you feel. We install whole-home air filtration systems, air purifiers, and air scrubbers that work alongside your existing HVAC equipment. If the air in your home feels stale, triggers allergy symptoms, or carries odors that do not clear on their own, an IAQ assessment is a reasonable next step.
Call and we'll get the air running right.
Regular maintenance is the most reliable way to avoid emergency calls and extend the life of your equipment. A seasonal tune-up covers a full inspection, cleaning, refrigerant check, airflow verification, and thermostat calibration. We catch small problems before they become expensive failures, and we flag anything that warrants attention without pushing repairs that are not yet necessary. Honest recommendations on repair versus replacement, never an upsell, is how we approach every maintenance visit.
Spring and fall are the natural windows for tune-ups: AC service before the heat arrives, heating service before temperatures drop. We also offer annual HVAC maintenance for commercial clients, including property managers and business owners who need their systems running reliably without disrupting operations.
When the system goes down, waiting days for a technician is not an option. We offer same-day HVAC service when slots are available, and we handle emergency calls for both no-heat and no-cool situations. A real local person answers when you call, and we work to get a technician on the way as quickly as the schedule allows. After-hours and weekend calls are part of what we do, because system failures do not keep business hours.
Heat restored. Cooling dialed in. Comfort back.
Trusted by homeowners. Relied on by property managers. Ready for your system.
We work with office managers, restaurant operators, retail property owners, and commercial property managers across the Universal City area. Commercial AC repair, furnace service, full system installation, and ongoing maintenance are all part of what we handle on the commercial side. Work is performed by qualified HVAC technicians familiar with the demands of commercial equipment, and we provide up-front estimates before any job begins. When scheduling flexibility matters, we do our best to work around your business hours so downtime stays minimal.
We are a family-run heating and cooling business that has been serving Universal City and the surrounding communities since 2016. Hire us and you're hiring a neighbor who knows your home. Our service area includes Converse, Schertz, Live Oak, Selma, Kirby, Windcrest, and Cibolo, and we are familiar with the homes, the climate, and the equipment that shows up most often in this part of Bexar County.
We serve Universal City and the surrounding Bexar County communities, including Converse, Schertz, Live Oak, Kirby, Selma, Windcrest, Cibolo, and the northeast San Antonio corridor. If you are unsure whether we cover your address, call (830) 590-9289 and we can confirm quickly.
Yes. We offer same-day scheduling when slots are available and take emergency calls for both no-heat and no-cool situations. After-hours and weekend calls are part of what we do, because system failures do not keep business hours. Call (830) 590-9289 and we will work to get a technician on the way as fast as possible.
We are available every day from 8:30 AM to 8:00 PM for regular service calls and scheduling. For emergency situations outside those hours, we handle after-hours calls as well. Call (830) 590-9289 and a real local person who knows the area will answer.
Check your thermostat settings and make sure it is set to the correct mode and temperature. Also check that the circuit breaker for the air handler or furnace has not tripped. If neither of those resolves it, call us and we will get a technician out to diagnose the problem properly.
Call (830) 590-9289 and we will check availability for same-day service. We keep same-day slots open when possible, especially during peak cooling and heating seasons. The sooner you call, the better chance we have of getting someone out the same day.
Yes. We give you a clear cost estimate before any work begins, so there are no surprise charges after the fact. Pricing is communicated honestly and up front, and we explain what we found and what it will cost in plain language before we start.
Payment is due when the job is complete. We will walk you through the final invoice and make sure everything is clear before we close out the visit. If you have questions about payment methods, call (830) 590-9289 and we can go over the details ahead of time.
For larger installations and system replacements, a deposit may be required to cover equipment ordering. We will let you know upfront before anything is ordered or scheduled, and the full cost breakdown will be explained clearly before you commit to anything.
Manuel Serrano HVAC Mechanical handles residential and commercial HVAC work from routine repairs through full system replacement. Same-day and emergency service are available, all work is performed by qualified HVAC technicians, and pricing is clear before any job begins. Whether you need a quick repair, a seasonal tune-up, or a complete system overhaul, we are ready to help.
Call (830) 590-9289 for a quote or to schedule service.
Right diagnosis. Right repair. Right on the first visit.
We handle the full range of residential and commercial heating and cooling work in Universal City and the surrounding Bexar County communities. Whether you need a quick repair, a seasonal tune-up, or a complete system replacement, the table below lays out what each service covers and who it is best suited for. If you have questions about your specific situation, call us and we will walk you through the options before any work begins.
| Service | What the Service Includes | When You Need It | Good to Know |
|---|---|---|---|
| Seasonal Maintenance and Tune-Ups | Full system inspection and cleaningRefrigerant and airflow checkThermostat calibrationSmall-problem identification before failure | Homeowners and property managers who want to extend equipment life and avoid emergency calls | Spring is the right window for AC service before the heat arrives; fall is the right time for heating service before temperatures drop. We also offer maintenance for commercial clients. |
| Full System Installation and Replacement | Equipment sizing for your home or buildingNew central AC or furnace installationFull system swap with matched componentsClear estimate before anything is ordered | Homeowners or property managers replacing an aging or failing HVAC system | Heavy cooling seasons in Bexar County accelerate wear; a properly sized replacement system can lower monthly energy costs noticeably compared to an aging unit running past its useful life. |
| Emergency HVAC Service | Same-day response when slots are availableAfter-hours and weekend callsNo-heat and no-cool emergency dispatchReal local person answers when you call | Any household or business where the system has gone down and waiting days for service is not an option | System failures do not keep business hours; we handle emergency calls and work to get a technician on the way as quickly as the schedule allows. |
| Heat Pump Installation | Site assessment and load calculationEquipment selection and sizingFull installation from start to finishZoning and comfort-control walkthrough | Homeowners looking to replace an aging central air system or add efficient heating and cooling from one unit | Heat pumps are a strong fit for the South Texas climate because mild winters mean the system rarely has to work at the limits of its heating capacity. |
| Indoor Air Quality and Air Filtration | Whole-home air filtration installationAir purifier and air scrubber setupHumidity and moisture assessmentIntegration with existing HVAC equipment | Households dealing with stale air, allergy symptoms, or persistent odors that do not clear on their own | Excess indoor humidity in this climate can affect air quality, not just comfort; addressing both filtration and humidity together often produces the biggest improvement. |
| Whole-Home Dehumidification and Humidity Control | Whole-home dehumidifier installationIntegration with existing HVAC equipmentHumidity level assessmentComfort and air quality improvement | Homes where high indoor humidity makes the air feel warmer than the thermostat shows or where moisture is straining the AC | Persistent humidity is common in Bexar County; a whole-home dehumidifier reduces the load on your AC and makes indoor spaces feel more comfortable at the same thermostat setting. |
| Furnace and AC System Replacement | Assessment of existing equipmentReplacement equipment recommendationFull installation by qualified techniciansEnergy-efficiency review as part of the process | Households where repairs have become frequent or efficiency has dropped sharply | Long run-times in South Texas heat add up fast; when repair costs approach the value of the equipment, replacement is often the smarter investment. |
| Thermostat and Smart-Control Installation | Wi-Fi and programmable thermostat installationReplacement of inaccurate or failed unitsSmart-control setup and app configurationMulti-zone control options | Homeowners who want better control over comfort and energy use, or whose current thermostat is not reading temperatures correctly | A thermostat upgrade is one of the lower-cost HVAC improvements with an immediate payoff, and it can be scheduled quickly without a major job window. |
| Ductwork Repair and Sealing | Duct leak location and diagnosisSealing of problem areasReplacement of deteriorated duct sectionsAirflow verification after repair | Homes with uneven temperatures room to room or higher-than-expected energy bills despite a functioning system | Leaky ducts are a common and underdiagnosed cause of comfort problems; a duct inspection often explains why a system that tests fine at the unit still cannot keep the house comfortable. |
| Heat Pump Repair and Service | Full system diagnosticRefrigerant and airflow checkReversing valve and controls inspectionRepair estimate before work begins | Homes with an existing heat pump that is not heating or cooling properly | Heat pumps handle both heating and cooling from a single unit, so a problem in one mode often points to a shared component worth catching early. |
| AC Repair and Service | Diagnostic and troubleshootingRefrigerant leak checkAirflow and controls inspectionSame-day repair when available | Homeowners or businesses with an AC that is not cooling, cycling oddly, or will not start | South Texas cooling seasons are long and hard on equipment; catching a small problem early usually costs less than waiting until the system fails mid-summer. |
| Heating and Furnace Repair | Furnace diagnostic and inspectionIgnition and heat exchanger checkBlower motor and controls serviceEmergency no-heat response | Households dealing with a furnace that blows cold air, short-cycles, or makes unusual sounds or smells | Winters in this area are mild but do arrive; a furnace that has sat idle all year should be checked before the first cold snap hits. |
How do I know if my AC or furnace needs to be replaced rather than repaired?
A few things point toward replacement: the equipment is more than 12 to 15 years old, repairs have been coming up more than once a season, or the cost of the next repair is approaching a significant fraction of what a new system would cost. We give honest repair-versus-replacement guidance based on the actual condition of the equipment, not on what produces the higher ticket. If you are unsure, call us and we will assess the system and walk you through the options.
Why would my system stop heating or cooling even though it appears to be running?
A system that runs but does not condition the air is usually dealing with one of a few issues: a refrigerant problem, a dirty or blocked coil, an airflow restriction from a clogged filter or leaky duct, or a controls failure. In some cases the outdoor unit is running but the indoor air handler is not moving air properly. A proper diagnostic at the unit is the only reliable way to find the cause. Call us and we will get a technician out to trace the problem from the start.
How often should I schedule a maintenance tune-up?
Once a year is the minimum, and twice a year is better if you want to catch problems in both the cooling and heating sides of the system. Spring is the right window for AC service before the long Texas cooling season begins, and fall is the right time to check the heating system before temperatures drop. Regular maintenance extends equipment life and is the most reliable way to avoid emergency calls.
Same-Day and Emergency Availability
We offer same-day scheduling when slots are open and take emergency calls for both no-heat and no-cool situations, including after hours and weekends. System failures do not keep business hours, and we work to get a technician on the way as quickly as possible.
What does a seasonal tune-up actually include?
A tune-up covers a full inspection of the system, cleaning of key components, a refrigerant check, airflow verification, and thermostat calibration. We look for anything that is starting to wear or underperform and flag it before it becomes a failure. We do not push repairs that are not yet necessary; if something can wait, we will tell you that clearly.
Is a heat pump a good choice for a home in this area?
Yes, for most homes in the Universal City area a heat pump is a practical and efficient option. Because winters here are mild, a heat pump handles the heating load without needing the heavy-duty output that colder climates demand. That makes it a solid replacement path for aging central air systems, giving you both heating and cooling from one unit. We assess your home and walk you through sizing and zoning options before recommending anything.
Why is one room in my home always hotter or colder than the rest?
Uneven temperatures are usually caused by duct leaks, an undersized or oversized system, blocked or closed vents, or poor airflow balance in the duct layout. In some cases a thermostat that is not reading accurately is part of the problem. A duct inspection and a look at the overall airflow often turns up the cause quickly. Call us and we will take a look at the system as a whole rather than just the unit.
Transparent Upfront Pricing
We give you a clear estimate before any work begins. Pricing is communicated in plain language, and we explain exactly what we found and what it will cost before we start. No surprise charges after the fact.
What can strange noises from my HVAC unit mean?
Different sounds point to different problems. A rattling or banging sound often means a loose or failing component inside the air handler or outdoor unit. A high-pitched squeal can indicate a blower motor or belt issue. A grinding noise is worth taking seriously and usually means something is wearing in a way that will get worse quickly. If your system is making a sound it did not make before, call us and describe what you are hearing. We can often narrow down the likely cause before the technician arrives.
How do indoor humidity levels affect my AC and my comfort?
High indoor humidity makes the air feel warmer than the thermostat shows, which causes the AC to run longer and work harder to reach the set temperature. Over time that adds wear to the equipment and raises energy costs. In Bexar County, ambient humidity is persistent, and a whole-home dehumidifier integrated with your existing HVAC equipment can make a real difference in both comfort and how hard the system has to work.
Family-Owned and Locally Operated
We are a family-run heating and cooling business serving Universal City and the surrounding Bexar County communities. Hire us and you're hiring a neighbor who knows your home.
Do I need to be home when the technician comes out?
Someone needs to be present to provide access to the equipment and to hear the diagnostic findings and estimate before any work begins. We give you a clear explanation of what we found and what it will cost before we start, so being available for that conversation matters. If scheduling is a challenge, call us and we will work with you to find a window that fits.
How does pricing work, and will I know the cost before anything starts?
Yes. We give you a clear estimate before any work begins, so there are no surprise charges after the fact. Pricing is explained in plain language, and we walk you through what we found and what the repair or installation will cost before we proceed. For larger jobs like a full system replacement, we explain up front if a deposit is required to cover equipment ordering.
What should I check before calling for emergency service?
Start with the thermostat: confirm it is set to the right mode and that the temperature setting is where you expect it. Then check whether the circuit breaker for the air handler or furnace has tripped. A clogged filter can also shut a system down by starving it of airflow. If none of those resolve it, call us. We handle same-day and after-hours emergency calls, and a technician will diagnose the problem properly rather than guessing.
Call (830) 590-9289 and we will talk through your system, answer your questions, and get you scheduled for service.
(830) 590-9289