When a landlord in Woodstock gets a call from a tenant saying the heat is out, the first priority is getting someone there fast. When a property manager is looking after several homes across McHenry County and one system goes down in the middle of a cold stretch, they need an HVAC contractor who picks up, gives a clear answer, and gets the work handled without a second call to follow up. That is what Al's A/C & Heating is here for. We cover Woodstock for heating and cooling repair, installation, maintenance, and emergency calls.
Woodstock is a city with a real mix of housing stock. Older homes with original equipment that has been running quietly for years, newer builds with systems that need proper setup, and rental properties where the owner is not on-site when something fails. All of it generates HVAC calls, and we handle them all. The person who answers the phone already understands what the job involves, so the conversation you have when you call is a useful one from the start.
Systems around here run into the same few faults, and some of them turn out to be something a homeowner or tenant can confirm before a technician arrives. Checking these first takes a few minutes and occasionally saves a service call.
Start with the thermostat. Confirm it is set to the right mode, heat or cool, and that the set temperature is actually above or below the current room temperature by enough to trigger the system. A thermostat that got bumped or had its settings changed is a common culprit. If the thermostat has batteries, low battery power can cause erratic behavior or a blank display.
Check the filter next. A filter that is heavily clogged restricts airflow enough to cause weak output, frozen coils, or a system that shuts down on its own. Pull it out and hold it to the light. If you cannot see through it, replace it before calling. Also check that the supply switch near the air handler is in the on position and that the circuit breaker for the HVAC equipment has not tripped. If everything checks out and the system still is not working, that is when you call. Give us a call and we will take care of it.
The air handler is the indoor half of the system, and the blower motor inside it is what moves conditioned air through the ductwork and into the rooms. When the blower is underperforming, the rest of the system can be working fine and the home still will not heat or cool properly. Weak airflow, noise from the air handler cabinet, or a system that runs but does not seem to do much are all reasons to have the blower inspected.
A home where some rooms are always too warm and others never warm up properly usually has a distribution problem rather than a failed unit. Leaking or improperly balanced ductwork is the most common cause. Duct sealing and repair restores airflow to where it belongs and makes the system work the way it was designed to. We handle ductwork inspection and sealing as part of a broader service visit when the symptoms point that way.
Small commercial buildings in Woodstock, offices, retail spaces, and similar premises, often run rooftop package units rather than the split systems common in residential work. These units handle heating and cooling in a single cabinet and require a technician who knows them. We service and repair rooftop units for commercial clients, including diagnosis, refrigerant leak diagnosis, and component replacement when a unit is failing.
Regional summers bring enough humidity that a central air conditioner alone does not always manage indoor moisture effectively. A whole-home dehumidifier integrates with the existing system and handles humidity across the entire house rather than one room at a time. On the other end, dry indoor air in winter is a comfort and air quality issue that a whole-home humidifier addresses. We install both and connect them to the existing HVAC equipment.
The heat exchanger is the component in a gas furnace that separates combustion gases from the air circulating through the home. A cracked heat exchanger is a safety concern, and it is not something to defer. Inspection is part of a standard furnace maintenance visit, and if a crack is found, we explain the options clearly before any work is authorized.
A thermostat that is not reading correctly or not communicating with the system properly affects everything downstream. We install programmable and smart thermostats, confirm compatibility with the existing equipment before installation, and walk through the setup so the controls actually get used. For properties with multiple zones, we can discuss control options that make independent temperature management practical.
A home that heats and cools right is a comfortable home, and getting the price right starts with understanding what the job actually involves. For a repair, the quote depends on what the fault turns out to be, what components need to be reached, and whether the parts are straightforward to source. A thermostat swap and a failed compressor are both repair calls, but they land very differently on the invoice.
For a replacement, the quote reflects the size of the equipment needed for the space, what is involved in removing the old unit, and whether the ductwork and electrical connections are already in good shape or need attention. A system going into a home where everything is compatible and accessible is a different job from one where the ductwork has not been touched in decades.
The way to get a price is to call. You get the rate on the phone before anything is scheduled, and the price covers what we have agreed the visit includes. Ask what it covers and you get a straight answer. We do not book anything until the number is clear. Call (779) 363-9289 to get a quote for whatever the system needs.
Getting your comfort problem handled starts with a quick call. When you reach us, we take down the details and confirm availability. Same-day service is often available for urgent calls, and for planned work, we schedule around what the property requires. For a rental unit with a tenant in place, we coordinate the visit so access works for everyone. For a business that has to stay open, we discuss what the job involves and how to minimize disruption before the technician arrives.
We are open every day from 5:30 AM to 11:00 PM. Emergency calls for no-heat and no-cool situations are taken within those hours, and a qualified HVAC technician gets out to the property as quickly as scheduling allows. The system is tested and readings checked before sign-off on every visit, so the job is confirmed complete before we leave.
We show up ready to go to work.
A system that is running but not performing correctly, or one that has stopped altogether, calls for a diagnostic visit first. The technician identifies the fault, explains what caused it, and walks through the repair before any work begins. Code-compliant HVAC work on every job is the standard we hold to, whether the repair is a minor component swap or something more involved. The work is performed by qualified HVAC technicians, and the system is confirmed working before the visit ends.
Preventive maintenance is the visit that keeps a working system from becoming an emergency call. For a furnace, that means a full inspection including the heat exchanger, burner condition, blower performance, and filter. For a central air system, it covers coil condition, refrigerant levels, and airflow. Scheduling a tune-up in the fall before heating season or in the spring before the first warm stretch is the best time to catch a developing problem before it becomes a failure. HVAC work sized and installed the way the manual calls for starts at installation, but annual maintenance is what keeps it there.
When repairs are no longer the practical answer, a full replacement is the next step. In this region, furnace and AC replacements often happen together because both units are typically the same age and replacing one while the other is near the end of its life rarely makes sense. We handle the full replacement, from removing the old equipment through installing and commissioning the new system. The service page carries the full breakdown of what each type of replacement involves.
Yes. We serve Woodstock and the surrounding communities throughout McHenry County. That includes Bull Valley, Ridgefield, Hartland, Wonder Lake, and Lakewood. If you are in the broader area and are not sure whether we reach your address, call and ask. We will confirm coverage before anything is scheduled.
Homeowners in Woodstock often read our HVAC services page before getting in touch.
We are open every day from 5:30 AM to 11:00 PM, which gives us flexibility to schedule visits outside standard business hours. When you call, let us know the access situation and we will work with you to find a time that fits the tenant's schedule.
Woodstock has a mix of housing ages, and older homes often present with equipment that has been running for a long time without a proper inspection. The most common calls involve furnaces that are not heating reliably, air conditioners that have lost refrigerant charge over time, and ductwork that was never properly sealed. A diagnostic visit identifies exactly what is happening before any repair is authorized.
It does, and the more specific the better. A banging noise on startup points somewhere different than a squeal during operation or a rattle that only happens when the blower runs at full speed. When you call, walk us through what you are hearing, when it happens, and how long it has been going on. That information helps us come prepared.
Yes. We coordinate the visit with whoever needs to provide access, whether that is the property owner, a property manager, or the tenant directly. The technician explains the diagnosis and the work to whoever is present, and nothing is started until the scope is confirmed. If you manage multiple properties in the Woodstock area, we can work through scheduling on the call.
Often yes. If there are multiple things to address, such as a thermostat that is not reading correctly, a filter that needs replacing, and a coil that has not been cleaned, we can usually handle them in one visit rather than scheduling separately. Let us know everything you want looked at when you call so we can plan the visit accordingly.
Ask us about this on the call when you are scheduling an installation. Registration requirements vary by manufacturer, and we can walk you through what applies to the equipment being installed and what steps need to happen after the job is done.
The best time to find out a system has a problem is before the weather forces the issue, not during it. Scheduling a maintenance visit in the fall before heating season or in the spring before cooling season means any developing fault gets caught while appointment availability is still flexible. Waiting until the first extreme weather day of the season means competing with every other call coming in at the same time.
Yes. Keeping pets in a separate room during the visit is the safest arrangement for the animal and the technician. Equipment being serviced or installed involves electrical components, refrigerant lines, and tools that are not safe around animals that might wander into the work area. We appreciate the help and it keeps the visit moving smoothly.
A photograph can be useful context, particularly for equipment condition or an obvious fault like ice buildup or physical damage. The most useful information when you call is a description of what the system is doing or not doing, how long it has been happening, and any model information you can find. The diagnostic happens on the visit, but the more detail you can give us on the call, the better prepared we can be.
Permit requirements depend on the type of work and where the property is located. A straightforward equipment swap often falls under a different category than a new installation or a ductwork modification, and requirements can vary between the city and the surrounding county. We confirm what applies at your address before the work is scheduled so there are no questions about compliance after the job is done.
Ice on HVAC equipment almost always means the system cannot move heat the way it should. The most common causes are restricted airflow from a clogged filter or blocked return, and low refrigerant from a leak somewhere in the system. Running the unit while it is frozen makes the problem worse, so the right move is to shut the system off and call us so we can find the root cause rather than just thaw the coil.
Al's A/C & Heating serves Woodstock and McHenry County for heating and cooling repair, installation, and maintenance. Planned work, a tune-up before the season changes, or a replacement before an aging system fails at the worst possible time, is always easier to schedule than an emergency call. Call today and get the visit on the calendar before the equipment makes the decision for you.
Call (779) 363-9289. We are open every day from 5:30 AM to 11:00 PM.
Call today. Scheduled tomorrow. Comfortable by the weekend.
We also take work in: Crystal Lake, Huntley, Poplar Grove. There is more on our list of communities.
Heating and cooling work covers a wide range of jobs, and knowing which service fits your situation makes scheduling easier. The table below lays out what we handle, who each service is best suited for, and a practical note to help you plan. If you have questions about a specific job or want to talk through your options, call for a quote and we will walk you through it.
| HVAC Service | What It Covers | Best For | Good to Know |
|---|---|---|---|
| Ductwork Repair & Sealing |
| homes with uneven temperatures, higher energy use, or a system that runs longer than it should | Leaky ducts waste conditioned air before it reaches the rooms it is meant to serve. Sealing gaps restores airflow and reduces the load on the main unit. |
| Emergency HVAC Service |
| any situation where a heating or cooling system has failed and waiting is not an option | Emergency calls are answered every day from 5:30 AM to 11:00 PM. You get a diagnosis before any work starts, not a guess. |
| Furnace & AC System Replacement |
| Woodstock homeowners whose furnace and central air system are both nearing the end of their useful life | Woodstock winters are long enough that furnace reliability is not optional. Pairing a furnace and AC replacement lets both systems be sized to the home at the same time. |
| Heat Pump Repair & Service |
| homes running a heat pump as the primary heating and cooling source | Heat pumps work both seasons, so faults can appear in summer or winter. The system is tested and readings checked before sign-off. |
| Whole-Home Dehumidification & Humidity Control |
| Woodstock homes that feel sticky or uncomfortable even when the AC is running during humid summer months | High indoor humidity makes a space feel warmer than it is and strains the cooling system. A whole-home unit handles moisture as part of the system, not as a standalone fix. |
| Indoor Air Quality & Air Filtration |
| households concerned about air quality, allergens, or how the home breathes day to day | Whole-home filtration works through the existing air handler, treating air moving through the system rather than just one room. |
| Thermostat & Smart-Control Installation |
| homeowners with an outdated or malfunctioning thermostat, or those wanting remote scheduling and control | Compatibility with the existing heating and cooling equipment is confirmed before installation. Zoning controls can also be discussed if different areas of the home need independent temperature management. |
| AC Repair & Service |
| homeowners and property managers with a struggling or failed air conditioner | Most common faults are identified on the first visit. Same-day service is available when scheduling allows. |
| Full System Installation & ReplacementMost Popular |
| homeowners replacing aging or failed HVAC equipment in a home or rental property | Replacing both the furnace and AC at the same time avoids sizing mismatches and is often the more practical path when both systems are aging. |
| Seasonal Maintenance & Tune-Ups |
| homeowners who want to catch developing problems before the heating or cooling season begins | Pre-season scheduling, before the first hot week of summer or the first cold snap of fall, is the best time to avoid an emergency call at peak demand. |
| Heat Pump Installation |
| homes adding a heat pump for the first time, including additions and rooms needing independent comfort control | Cold-climate heat pump models now perform well in northern Illinois winters. Ductless mini-splits are a clean option where no existing ductwork is available. |
| Heating & Furnace Repair |
| any home or building that has lost heat or is heating unevenly | Calls are answered every day from 5:30 AM to 11:00 PM, including weekends, so a Saturday morning no-heat situation does not have to wait. |
Every job is different, and the right answer for your home or building depends on the equipment, the situation, and what you are trying to solve. Call for a quote and we will talk through it with you: (779) 363-9289.
(779) 363-9289