When a furnace stops firing or an air conditioner quits on a hot afternoon, what matters is getting the right person on the phone and getting the problem fixed. Al's A/C & Heating handles heating and cooling work across DeKalb, from a single faulty component on a system that is otherwise running well to a full equipment replacement when the old unit has reached the end of its useful life. Homeowners, rental property owners, and commercial building managers all call the same number and reach the same people. Calls are answered by someone who knows the trade and can scope the job on the phone.
We cover the full range: AC repair and service, furnace and heating repair, heat pump installation and service, ductwork repair and sealing, thermostat and smart-control installation, indoor air quality, seasonal maintenance, and emergency no-heat and no-cool calls. If you are searching for HVAC service in DeKalb and want to know what it costs and how soon someone can be out, call (779) 363-9289. We are open every day from 5:30 AM to 11:00 PM.
A system that is relatively young and has a specific, identifiable fault is almost always worth repairing. A failed igniter, a refrigerant leak at a known location, a blower motor that has worn out, a thermostat that has stopped communicating correctly: these are contained problems with contained costs. We diagnose the fault first, explain what we found, and give you the price before any work begins. If the repair is the sensible answer, we do the repair.
The calculation changes when a system is old enough that the repaired component is unlikely to be the last one to go. Repeated service calls on aging equipment add up, and at some point the money spent keeping it running would have covered a new installation. We walk through that math on the call when it applies. A replacement done right, sized correctly for the home or building, and installed to manufacturer specifications, runs better from day one than a patched-together system that has been limping along. HVAC work sized and installed the way the manual calls for is the standard we hold to on every installation we do in DeKalb.
Same-day service is often available, particularly for no-heat and no-cool situations where waiting is not a practical option. When you call, we take down the details, confirm pricing before anything is scheduled, and get a qualified HVAC technician headed to the address. We are open every day from 5:30 AM to 11:00 PM, which covers the early morning calls when a furnace has been out overnight and the evening calls when an AC goes down after a hot day.
For rental properties and commercial spaces that need to stay open, we work around the situation. That means confirming the appointment window when you call, letting you know who is coming, and getting the diagnosis and repair done without making the property unusable for longer than necessary. A property manager dealing with a tenant without heat or cooling gets the same urgency as a homeowner in the same situation. Call and we will get your heat or AC back on.
What a job costs depends on what the fault turns out to be, what has to be accessed to reach it, and whether a repair or a replacement is the right answer once the system has been looked at. There is no single number that covers every situation, which is why we confirm pricing on the call before anything is scheduled. You get the rate on the phone, and you can ask what it covers and get a clear answer.
What moves a quote in one direction or another: the type of equipment involved, how accessible the components are, whether parts need to be sourced, and the scope of the work. A straightforward thermostat swap is a different conversation from a compressor replacement or a full system installation. We do not book anything until the price is agreed and the scope is understood. Call (779) 363-9289 for a quote on whatever the system needs.
When a home gains a new room or a finished basement, the existing duct system usually was not designed to reach it. Extending ductwork into an addition is not just a matter of running a new branch. The whole system needs to be able to move enough air to the new space without starving the rooms it already serves. We assess the existing system, size the new runs correctly, and make sure the airflow reaches where it is supposed to. Code-compliant HVAC work on every job means the installation is done to the standard the equipment and the building require.
A system that runs and runs without reaching the set temperature is telling you something is wrong. Low refrigerant, a dirty evaporator coil, an undersized unit, leaking ducts, or a failing compressor can all produce the same symptom. Airflow and uneven-temperature troubleshooting starts with a full diagnostic rather than a guess. We identify the actual cause before recommending a fix, because the wrong repair on the wrong cause is money spent twice.
The outdoor unit takes the most wear over a cooling season, and compressor or condenser problems are among the more serious faults a system can develop. A compressor that is drawing too much current, a condenser coil that is blocked or damaged, or a refrigerant charge that has been low long enough to stress the compressor all require a thorough inspection before a repair path is chosen. The system is tested and readings checked before sign-off, so the repair is confirmed to have held before we leave.
A furnace that will not fire, blows cold air, or shuts off before the home reaches temperature is an urgent problem in this part of the country. We handle no-heat calls every day during the heating season, and same-day response is often available. A furnace diagnostic covers ignition, burner operation, heat exchanger condition as part of the standard inspection, blower performance, and the thermostat signal. We explain what we found and what the repair involves before any work starts.
The situation that leads to a repair call is usually straightforward: something stopped working, or something is working badly enough that it cannot be ignored. For a homeowner, that might be a furnace that quit overnight. For a landlord, it might be a tenant reporting no cooling in the middle of summer. The diagnostic process is the same either way. We identify the fault, confirm the price, and carry out the repair. The system is tested before we leave.
A system that is running today can be a system that fails at the worst possible moment if it is not looked at regularly. Preventive maintenance visits cover filter condition, refrigerant charge, coil cleaning, electrical connections, and a full operational check. Scheduling a maintenance visit before the heating or cooling season starts is the most reliable way to catch a developing problem before it becomes an emergency call. We offer seasonal tune-ups for both residential and commercial equipment in DeKalb and the surrounding area.
Replacement calls come from a few different starting points. Sometimes a repair visit reveals that the equipment is too far gone to fix practically. Sometimes a homeowner has been tracking the repair costs and decides the math no longer works. Sometimes a property manager is planning ahead for a unit that is clearly near the end of its life. Whatever the starting point, the process is the same: we size the replacement correctly for the space, confirm the price before scheduling, and install the new equipment to code. The service page carries the full breakdown of what a replacement covers.
We cover DeKalb and the surrounding DeKalb County area, including Cortland, Sycamore, Malta, Maple Park, and Waterman. Whether the address is in the city or further out in the county, the same qualified HVAC technicians handle the call, the same pricing process applies, and the same standard of work follows. If you are in the area and not certain whether we reach your address, call and ask. We will give you a straight answer before anything is scheduled.
Heat restored. Cooling dialed in. Comfort back.
If you are working out what the job needs, our system guide goes through it.
DeKalb is a city of meaningful size, and we schedule calls there regularly. Same-day service is often available for urgent repair calls, and near-term appointments are generally available for maintenance and non-emergency work. Calling early in the day gives us the best window to fit you in quickly.
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.
A system that runs without satisfying the thermostat is usually either undersized for the space, losing capacity because of a refrigerant or airflow problem, or fighting heat gain or loss through the building envelope that the equipment cannot overcome on its own. A diagnostic visit identifies which of those is driving the problem so the fix addresses the actual cause.
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.
We need someone present to provide access to the equipment and to authorize the work once the technician explains the diagnosis and the price. If nobody is available at the scheduled time, call us as early as possible to reschedule so the slot can be used for another call. For exterior-only work, we can discuss arrangements on the call, but indoor access requires someone to be there.
It depends on the condition of the equipment and what the maintenance visit turns up. A tune-up on an aging system can still catch a developing fault before it becomes an emergency, and keeping the system running efficiently in its final years is better than letting it degrade. If the inspection points toward replacement being the more practical path, we will tell you that directly so you can make an informed decision.
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.
It is. Intermittent faults are often early signs of a component that is starting to fail, and catching them before the system quits entirely is almost always less disruptive and less costly. Describing what the system does when the problem shows up, even if it seems minor, gives the technician a useful starting point for the diagnostic.
The process is the same as for any other call. You describe the situation, we confirm the address and the equipment involved, give you a price on the phone, and schedule a technician. For occupied rental units, we work around the tenant's presence and aim to get the system back up on the same visit whenever the fault allows for it.
It depends on what has failed and what the system can safely do without the missing component. In some cases we can get the equipment running in a limited way while a part is sourced. We explain what is possible on the visit and confirm whether a temporary arrangement is safe before we leave the system running.
Yes, and it is a relatively straightforward visit. A thermostat that is not communicating correctly with the system, reading the wrong temperature, or simply outdated can cause the whole system to behave erratically. Installing a programmable or smart control on its own often improves how the system runs day to day without any other changes to the equipment.
Al's A/C & Heating covers DeKalb, Sycamore, Cortland, Malta, Maple Park, Waterman, and the communities throughout DeKalb County. If your heating or cooling system needs attention, whether it is a repair, a tune-up, or a full replacement, call (779) 363-9289 and we will get it handled. 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: Sycamore, Rochelle, Huntley, Cherry Valley, Belvidere. 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 |
| DeKalb homeowners whose furnace and central air system are both nearing the end of their useful life | DeKalb 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 |
| DeKalb 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