We fix what's broken, fast, and we don't disappear after the invoice. Emergency dispatch available across Dundee and the surrounding zip codes.
Call +1-866-805-8548 and describe what your system is doing — the symptoms help us send a tech prepared with the right parts.
You'll get a flat-rate quote before any repair work begins — no guessing what the final bill will look like.
If anything feels off after we leave, a follow-up call gets a technician back out to make it right.
Leonard HVAC was built by technicians who got tired of watching homeowners get oversold. We invest in ongoing training so our techs recognize a failing capacitor, a cracked heat exchanger, or a refrigerant leak before it turns into an emergency.
You won't find us buried under layers of call-center scripts — we're the crew that answers the phone at 2am when your furnace quits in the middle of a cold snap. We carry the credentials Dundee inspectors and property managers expect to see, and we keep that documentation available on request for every job, residential or commercial.
We know which neighborhoods run on older ductwork and which subdivisions were built with newer high-efficiency systems. That local knowledge shapes the maintenance schedules we recommend — it's the difference between a tech who's guessing and a tech who's seen your exact situation a hundred times before.
Ask around Dundee and you'll hear the same complaint about a lot of HVAC companies. That's the gap we built Leonard HVAC to close. Every dispatcher, every technician, and every follow-up call is held to the same standard, because a customer who trusts us once tends to call us again — and Dundee is a small enough community that reputation travels fast.
That local context saves time on every call, because we're not starting from zero on basic questions about your neighborhood or your system. Our warranty and service history records stay attached to your address, so any future technician who visits already has the full picture.
Whether it's a mid-summer breakdown or a planned system replacement, our Dundee techs handle it with the same level of care.
A dead system in the middle of a heat wave or a cold snap isn't just inconvenient — it can be a real safety issue for kids, pets, and older residents. Our Dundee dispatch team sends the closest available truck first so a technician is diagnosing your system as fast as physically possible.
We keep the truck stocked with the parts that fail most often on the equipment common to Dundee homes, which is exactly why most repairs don't require a return visit.
Not every repair call ends in a repair — sometimes the honest recommendation is a properly sized replacement. We walk Dundee homeowners through load calculations so the new system is sized correctly for the actual square footage before a single piece of equipment gets ordered.
We protect floors and entryways during the install and haul away the old equipment so you're not left dealing with disposal.
A retail floor, a restaurant kitchen, or an office suite can't run without stable climate control. Our commercial division services multi-zone commercial buildouts across Dundee, with priority response for facilities that can't afford downtime.
We understand that a commercial call isn't just about comfort, it's about keeping a business open.
Preventive maintenance is the cheapest repair you'll ever pay for, because it's the one that prevents the bigger bill. Beyond standard tune-ups, we also handle humidifier, dehumidifier, and air purifier installation for Dundee households that want more than just temperature control.
We'll show you photos of anything concerning we find, along with a plain-language explanation of what it means and whether it's urgent.
Guarantees only mean something if a company actually honors them, so here's exactly what ours covers.
Details vary by job type and are always shared upfront, never buried in fine print.
Emergency dispatch never comes with a hidden surcharge sprung on you after the fact.
A technician doesn't consider the job done until the system is tested and performing correctly.
Catching these signs early usually means a same-day repair instead of an emergency call at the worst possible moment.
Rattling during startup often means a component has worked itself loose and needs tightening before it causes real damage.
If some rooms stay hot or cold no matter what the thermostat says, the system may be struggling to distribute air evenly.
Gradual efficiency loss is easy to miss month to month, but it adds up fast over a season.
This is one of the warning signs we recommend not waiting on.
A burning smell should never be ignored — it can indicate an electrical issue that needs immediate attention.
We'll always tell you honestly when a repair is the better call versus when it isn't.
You'll know the cost before a wrench touches your system.
Emergency calls get moved to the front of the line automatically.
Parts and labor are backed by warranty terms explained in plain language.
Every technician carries current state licensing and manufacturer training.
We explain what failed, why it failed, and what the options are.
Maintenance plan members get priority scheduling and discounted rates.
We don't write these — our customers do.
"I called three other companies first and this was the only one that actually picked up. No pressure to buy a whole new system when a repair was all we needed."
"We've used them for our maintenance plan for two years now and never had a surprise breakdown. Techs are always polite, always on time, and clean up after themselves."
"Explained the sizing calculation so I understood why they weren't just installing the same unit again. New system is noticeably quieter and our energy bill actually dropped."
"Commercial dispatch was quick and the tech understood our system without needing to be walked through it. Kept our kitchen running through the weekend rush."
"Got quotes from four different companies for a replacement and this was the only one that actually walked me through the load calculation. Would use them again without hesitation."
"Called at 11pm during a heat wave and honestly didn't expect anyone to pick up, let alone show up. No overnight surcharge shock — the price matched what dispatch quoted me on the phone."
After thousands of service calls across Dundee, a handful of causes show up again and again.
Dundee's seasonal swings put real stress on a system that isn't maintained regularly. Filters should be checked monthly during heavy-use seasons and replaced roughly every 60-90 days depending on your household and any pets.
Setting a programmable or smart thermostat to a consistent schedule reduces the number of times the system has to work hard to catch up to a big temperature swing. None of this replaces a professional tune-up, but it does reduce the wear that leads to premature breakdowns between visits.
Our technicians train across the major residential and commercial equipment lines, so you're not limited to a single brand's service network. If your system was installed by a different company entirely, that's not a problem — we service equipment regardless of who originally put it in, and we'll pull the model and serial information to confirm parts compatibility before any repair begins.
Here's a look at the kind of experience that shows up at your door.
Handles the majority of Dundee installs and specializes in properly sizing equipment for older housing stock.
Keeps the emergency truck stocked based on what actually fails most often locally.
Works directly with Dundee property managers to schedule around business hours.
For emergency no-heat or no-cool calls, we prioritize dispatch and aim to have a technician on-site the same day, often within a couple of hours.
We explain the diagnostic fee upfront and provide a flat-rate repair quote once the issue is identified.
We staff after-hours dispatch specifically because HVAC failures rarely happen on a convenient schedule.
Yes — licensing and insurance documentation is available on request for any job, residential or commercial.
We never push a replacement when a straightforward repair will genuinely solve the problem.
Ask your technician about current plan pricing during any service call.
We cover Dundee and the surrounding communities, including the zip codes listed in our coverage section below.
Yes, we run separate residential and commercial divisions, both fully licensed and equipped for their respective equipment.
If parts require special ordering for a less common brand, we'll communicate that timeline upfront.
We understand a full system replacement is a significant expense, which is why flexible payment options exist.
Systems that run harder due to heavy year-round use may benefit from more frequent check-ins.
If you smell gas or burning, shut off the system at the breaker and step outside, then call us immediately.
We'd rather quote it honestly on the phone than have you feel ambushed by the bill.
More involved repairs, like a coil replacement or a refrigerant leak repair, take longer and the tech will give you a realistic estimate before starting.
For most residential visits, yes, an adult should be present to grant access and approve any quoted work.
From the older, established streets near the center of Dundee to the newer developments on the outskirts, our trucks cover the full footprint of the city.
If you manage several units or a shared system across a Dundee property, ask about setting up a standing service account so every request gets handled under one consistent agreement.
A full system replacement is one of the bigger home expenses most people face, and we don't expect everyone to pay it in a single lump sum. If a rebate or local incentive program applies to your Dundee installation, our technicians will flag it during the estimate rather than leaving you to track it down after the fact.
If your address falls within Dundee, IL and near Dundee, there's a strong chance we already service your street.
If you're on the edge of our listed zip codes, it's still worth a call, since routes and coverage get adjusted as demand shifts.
