No overselling, no guesswork — just a Hvac crew that diagnoses it right the first time. Same-day appointments available across Fond du Lac 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.
Ask as many questions as you want; we'd rather over-explain than leave you unsure.
Most repairs are completed same-visit, and we test the system before we leave to confirm it's actually holding.
Leonard HVAC didn't start as a franchise chasing volume. Our crews carry manufacturer certifications across the major residential and commercial equipment lines.
We're not interested in being the cheapest quote on the page — we're the company that tells you what actually needs fixing instead of what pads the ticket. Licensing and insurance aren't optional line items for us, and we keep that documentation available on request for every job, big or small.
Fond du Lac's climate swings hard, and generic national playbooks don't always fit. That local knowledge shapes the parts we stock on the truck — it's the difference between a tech who's guessing and a tech who's seen your exact situation a hundred times before.
Too many homeowners in Fond du Lac have a story about a tech who showed up late, quoted one price, and charged another. 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 Fond du Lac 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.
Every service below is backed by the same licensing, warranty, and upfront pricing you get on any job we run.
Breakdowns rarely happen at a convenient time, which is exactly why our emergency line runs 24 hours a day. Our Fond du Lac dispatch team sends the closest available truck first so a technician is diagnosing your system as fast as physically possible.
Once a technician is on-site, the goal is always a same-visit repair — most emergency calls in Fond du Lac get resolved in a single trip, not a multi-day back-and-forth.
Not every repair call ends in a repair — sometimes the honest recommendation is a properly sized replacement. We walk Fond du Lac homeowners through financing and rebate options where available before a single piece of equipment gets ordered.
Every install ends with a performance test, confirming airflow, temperature split, and refrigerant charge are all where they should be before we consider the job finished.
Downtime in a commercial space costs money every hour a system is offline. Our commercial division services light industrial and warehouse ventilation across Fond du Lac, with service agreements built around your operating hours.
We understand that a commercial call isn't just about comfort, it's about keeping a business open.
Most emergency breakdowns start as a small, ignorable warning sign months earlier. Beyond standard tune-ups, we also handle humidifier, dehumidifier, and air purifier installation for Fond du Lac 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.
This is the standard every Fond du Lac technician on our team is held to.
Every repair comes with a workmanship warranty explained in plain terms before we leave.
Emergency dispatch never comes with a hidden surcharge sprung on you after the fact.
If anything feels off after we leave, one call gets a tech back to your Fond du Lac address.
Catching these signs early usually means a same-day repair instead of an emergency call at the worst possible moment.
Ignoring new noises is one of the fastest ways to turn a small repair into a major one.
Weak airflow from the vents often traces back to a clogged filter, a failing blower motor, or leaking ductwork.
A system working harder than it should to hit the same temperature shows up directly on your utility bill.
A system that won't hold a steady cycle is often fighting a sizing issue, a thermostat problem, or a refrigerant imbalance.
A musty smell often points to mold or moisture buildup somewhere in the ductwork.
Repeated repairs on an aging system are usually the clearest sign that replacement will save more money than another patch job.
We explain diagnostic fees and repair estimates before authorizing work.
Because our trucks are stationed near Fond du Lac, we're rarely far from your address.
If something isn't right after we leave, we come back and make it right.
We run background checks because you're letting someone into your home.
Photos and plain-language notes accompany every diagnostic.
Maintenance plan members get priority scheduling and discounted rates.
We don't write these — our customers do.
"Our AC quit on the hottest weekend of the year and they had a tech out within a couple of hours. 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. Never once felt like I was being upsold on something I didn't need."
"Had a full system replacement done and it was the smoothest home project I've had in years. 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. Now our go-to for every property in the portfolio."
"I appreciated that they didn't try to sell me a bigger unit than I needed. Would use them again without hesitation."
"The tech walked me through what he was checking as he went, which I really appreciated. This is the company I'm saving in my phone now."
After thousands of service calls across Fond du Lac, a handful of causes show up again and again.
The shift between peak heating and peak cooling demand is exactly when older or neglected equipment tends to fail. Before the heaviest cooling months hit, it's worth having the refrigerant charge checked, the condenser coils cleaned, and the filter replaced — all of which directly affect how hard the compressor has to work.
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.
Whether your Fond du Lac home has a traditional split system, a ductless mini-split, a heat pump, or a hybrid dual-fuel setup, our crews are equipped to diagnose and repair it. 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.
Manufacturer-certified across multiple major residential equipment lines.
Runs point on overnight and weekend emergency calls throughout Fond du Lac.
Experienced with the light industrial and retail equipment common across the area.
Standard appointments are usually scheduled within 24-48 hours, while true emergencies jump the queue.
Our policy is simple: you approve the number before we touch the system.
Our emergency line runs 24 hours a day, including nights, weekends, and holidays.
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.
Yes, our maintenance plans include seasonal tune-ups, priority scheduling, and discounted repair rates for members.
If you're unsure whether your address falls in our service area, a quick call to +1-866-805-8548 will confirm it.
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.
Financing options are available for qualifying replacement installations, and our team can walk you through what's currently offered.
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.
Our pricing is explained clearly before dispatch, and any after-hours consideration is communicated upfront — never as a surprise on the final invoice.
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.
Let dispatch know ahead of time if access will be handled differently than a standard homeowner visit.
From the older, established streets near the center of Fond du Lac to the newer developments on the outskirts, our trucks cover the full footprint of the city.
Larger properties get the same upfront pricing and licensed technicians as a single-family service call, just coordinated at scale.
We accept standard payment methods for repairs and smaller jobs, and we'll always tell you upfront what a given service is likely to cost so there's no last-minute scramble to figure out payment. If a rebate or local incentive program applies to your Fond du Lac 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 Fond du Lac, WI and near Fond du Lac, 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.
