We fix what's broken, fast, and we don't disappear after the invoice. Emergency dispatch available across Mercer Island 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.
A licensed technician arrives, runs a full diagnostic, and explains exactly what's wrong in plain language.
If anything feels off after we leave, a follow-up call gets a technician back out to make it right.
Leonard HVAC grew one honest service call at a time in communities like Mercer Island. 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.
We're not the biggest name in Mercer Island — we're the crew that answers the phone at 2am when your furnace quits in the middle of a cold snap. Licensing and insurance aren't optional line items for us, 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 how we diagnose problems — it's the difference between a tech who's guessing and a tech who's seen your exact situation a hundred times before.
Trust in this industry gets eroded fast, and it takes real consistency to earn it back. That's the gap we built Leonard HVAC to close. We'd rather lose a job to a lower bid than win one by cutting corners on the diagnosis, because a customer who trusts us once tends to call us again — and Mercer Island is a small enough community that reputation travels fast.
Our office team is based locally too, not routed through an out-of-state call center that's never seen a Mercer Island rooftop unit. We keep parts inventory stocked based on what actually fails most often on Mercer Island's housing stock.
Whether it's a mid-summer breakdown or a planned system replacement, our Mercer Island techs handle it with the same level of care.
Breakdowns rarely happen at a convenient time, which is exactly why our emergency line runs 24 hours a day. Our Mercer Island dispatch team prioritizes no-heat and no-cooling calls 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 Mercer Island homes, which is exactly why most repairs don't require a return visit.
An aging system that's constantly breaking down usually costs more to keep patching than to replace. We walk Mercer Island 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.
Downtime in a commercial space costs money every hour a system is offline. Our commercial division services light industrial and warehouse ventilation across Mercer Island, with service agreements built around your operating hours.
Property managers working with multiple Mercer Island locations can set up a standing account so every site gets consistent service history and pricing.
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 Mercer Island 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.
We'd rather set clear expectations upfront than make vague promises we can't back up.
If the same issue returns within the warranty period, we come back and fix it at no additional labor cost.
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.
A little attention to how your system is running can save you a lot of money and discomfort.
A healthy system runs with a consistent, low hum — banging, screeching, or grinding usually points to a loose part or failing motor.
Weak airflow from the vents often traces back to a clogged filter, a failing blower motor, or leaking ductwork.
A tune-up often identifies exactly what's driving the extra energy use.
A system that won't hold a steady cycle is often fighting a sizing issue, a thermostat problem, or a refrigerant imbalance.
Chemical odors may signal a refrigerant leak, which requires a licensed technician to handle safely.
We'll always tell you honestly when a repair is the better call versus when it isn't.
We explain diagnostic fees and repair estimates before authorizing work.
Dispatchers give you a realistic arrival window instead of a vague "sometime today".
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.
We explain what failed, why it failed, and what the options are.
We'll walk you through what's actually available before you decide.
Every review below reflects an actual service call in the Mercer Island area.
"The furnace stopped working overnight and someone was at our door before 9am. No pressure to buy a whole new system when a repair was all we needed."
"Signed up for the annual plan after our first repair and it's paid for itself already. 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. Would recommend to anyone in Mercer Island needing a real replacement, not a patch job."
"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. Installation crew was in and out in a day and left the space cleaner than they found it."
"Diagnosed a failed capacitor and had it swapped within the hour. No overnight surcharge shock — the price matched what dispatch quoted me on the phone."
After thousands of service calls across Mercer Island, a handful of causes show up again and again.
Homeowners who schedule a tune-up ahead of each season tend to call us far less often for emergency repairs. Filters should be checked monthly during heavy-use seasons and replaced roughly every 60-90 days depending on your household and any pets.
Simple habits between professional visits also matter. None of this replaces a professional tune-up, but it does reduce the wear that leads to premature breakdowns between visits.
We also service package units common on manufactured and modular homes throughout the Mercer Island area. 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.
We don't outsource dispatch to a call center that's never met our technicians.
Handles the majority of Mercer Island installs and specializes in properly sizing equipment for older housing stock.
Keeps the emergency truck stocked based on what actually fails most often locally.
Experienced with the light industrial and retail equipment common across the area.
Because our trucks are staged near Mercer Island, average arrival windows run faster than what national chains typically offer.
Our policy is simple: you approve the number before we touch the system.
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.
Plan members typically see fewer surprise breakdowns because small issues get caught during routine visits.
Our dispatch area extends throughout the greater Mercer Island region and nearby towns within Mercer Island, WA.
Yes, we run separate residential and commercial divisions, both fully licensed and equipped for their respective equipment.
Our technicians are trained across the major residential and commercial equipment lines, not limited to a single manufacturer.
We understand a full system replacement is a significant expense, which is why flexible payment options exist.
Most Mercer Island homes benefit from two tune-ups a year — one before cooling season and one before heating season.
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.
Straightforward fixes like a capacitor swap or a thermostat replacement are often finished in well under an hour.
For most residential visits, yes, an adult should be present to grant access and approve any quoted work.
Housing stock varies a lot across Mercer Island — older homes often still run original ductwork that needs different care than the sealed, high-efficiency systems going into newer builds.
If you manage several units or a shared system across a Mercer Island property, ask about setting up a standing service account so every request gets handled under one consistent agreement.
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 Mercer Island installation, our technicians will flag it during the estimate rather than leaving you to track it down after the fact.
We dispatch throughout Mercer Island and the neighboring communities, keeping response times tight because our trucks stay close to home.
Property managers with multiple Mercer Island addresses can consolidate everything under one account for simpler scheduling and consistent pricing across every location.
