When the heat goes out or the AC stops working, the question is not which company is closest. It is which company will actually diagnose the problem, give you a price before starting, and get the work done right. We handle the full range of heating and cooling work for homes and properties across St. Helena and the surrounding Napa County area. Furnace repair, AC service, heat pump installation, ductless systems, thermostat upgrades, ductwork, and indoor air quality all fall within what we do.
Call us at (707) 892-4623 and we will talk through what is happening and what the visit will cover.
St. Helena is a town where a lot of the housing stock was built before central air conditioning was standard, and where systems that have been running for years without much attention are common. That shapes the calls we get. It also means we are used to working on equipment that has not been serviced recently, on homes where the ductwork was never quite right for the layout, and on properties where a first-time cooling install is the right conversation to have. Whatever the situation, the repair or install scope is priced before the work starts, and nothing is authorized without your agreement first.
You do not need to know what is wrong before you call. What helps is knowing what the system is doing, or not doing. Is it running but not cooling? Not turning on at all? Making a noise it did not used to make? Blowing air that is not reaching the right temperature? Those details let the person on the phone ask the right follow-up questions and scope the visit accurately.
It also helps to know the type of system you have if you can, whether that is a central furnace and AC, a heat pump, a ductless mini-split, or something older you are not entirely sure about. If you do not know, describe what you see: where the indoor unit is, whether there is an outdoor unit, and roughly how old the equipment is. We will work out the rest from there.
Once we understand the job, we confirm what the visit will cover and what it will cost before anything is scheduled. Factors that affect the price include what type of system is involved, what the symptoms point to, and whether the visit is a diagnostic, a repair, or an installation. If the diagnostic finds something that changes the scope, we explain it and confirm the updated price before any additional work is authorized. We'll explain the diagnosis before any work is authorized.
Appointments are arranged on the call, and we confirm what is available at the time of booking. We are open every day from 7:30 AM to 10:00 PM, which covers most of the situations that come up, including the ones that feel urgent. We do not promise a specific arrival window, but we take short-notice work and will tell you honestly what the schedule allows when you call.
When a property has no heat or no cooling at all, that changes the priority of the conversation. A no-heat call in winter and a no-cool call during a stretch of hot weather are both treated as urgent, and we take those calls seriously. If you are dealing with a system that is completely down, call us and describe what is happening. We will work through it with you and get the visit arranged as quickly as the schedule allows.
For tenants or businesses that need to stay operational during the work, let us know when you book. The visit can be scoped and scheduled with that in mind. A commercial property or a rental with an occupied unit is not a complication. It is a normal part of how we work.
A compressor that is struggling or a condenser unit that is not rejecting heat properly will show up as an air conditioner that runs constantly without cooling the space, or that shuts off before the set temperature is reached. These faults are worth diagnosing carefully before a replacement is assumed, because the cause is not always the compressor itself. Electrical issues, refrigerant charge problems, and airflow restrictions through the condenser coil can each produce similar symptoms. The diagnostic works through them in order.
An evaporator coil that is coated in dust and debris cannot absorb heat from the air passing over it, which means the system runs but does not cool effectively. In some cases the coil freezes, which blocks airflow entirely and makes the problem worse. Cleaning restores performance in many cases. Where the coil is damaged or leaking refrigerant, repair or replacement is the next step. Either way, the coil condition is part of a complete AC diagnostic.
A cracked heat exchanger is one of the more serious findings on a furnace visit, because it separates the combustion gases from the air that circulates through the home, and a crack in that barrier is a safety concern. The inspection covers the full heat exchanger, not just a visual check of the visible sections. If the inspection finds a crack or a failure, we explain what it means and what the options are before any work is authorized.
A grinding noise from a blower motor, a banging from the outdoor unit, a clicking that continues after startup, or a high-pitched squeal from the indoor air handler all point to different causes. Describing the noise on the call, including when it happens and whether it is constant or intermittent, helps narrow the diagnosis before the visit. We do not guess at the cause and charge for the wrong repair.
A room that never reaches the set temperature while the rest of the home is comfortable is often a ductwork problem, a zoning issue, or a symptom of a system that was never sized correctly for the layout. Homes that have had additions, rooms converted from other uses, or ductwork that was run without a proper design are common sources of this complaint. The diagnostic covers the system and the distribution together rather than treating them as separate problems.
For properties in this part of California, wildfire smoke is a seasonal reality, and standard HVAC filters were not built to handle it. Upgrading to MERV-13 or higher-rated filtration captures fine particulate matter that passes straight through a basic filter. The installation visit checks whether the existing air handler can support the denser media without restricting airflow. Where it can, we upgrade the filter housing or media. Where it cannot, a whole-house filtration unit installed in the duct system is the better path. We also handle air purifier installation and general indoor air quality assessments for properties dealing with dust, odors, or allergen concerns. The specifics for a job like this are on our full list of HVAC services.
Leaking or poorly designed ductwork is one of the most common reasons a heating or cooling system underperforms, and it is one of the least visible. Conditioned air that escapes into an attic or a wall cavity before it reaches the room it was meant for is wasted capacity. The system works harder, the energy bill goes up, and the room stays uncomfortable regardless of what the thermostat says.
In a town where many homes have been added to or reconfigured over the years, ductwork that was never designed for the current layout is a recurring issue. Rooms that were converted, ceilings that were dropped, or additions that were connected to an existing duct run without accounting for the added load all create distribution problems that show up as comfort complaints.
Duct sealing and repair address the leakage without requiring the house to be opened up. We inspect the accessible sections, identify where conditioned air is escaping, and seal or replace the sections that are losing air. Where the duct layout itself is the problem, we can discuss what a redesign of the affected runs would involve.
HVAC pricing depends on what the job actually turns out to be, and that is not always clear until the diagnostic is done. The type of system, its age and condition, the fault that is found, and how accessible the equipment is all affect what the work costs. A straightforward repair on an accessible unit costs differently from a repair that requires removing panels, working in a tight attic space, or sourcing a part for older equipment.
For a replacement, the size of the system matters. Load calculations done properly on a replacement account for the square footage of the space, the insulation, the window area, and the layout, not just what was there before. Replacing an undersized or oversized system with the same size does not fix the comfort problem. We size to the building.
What does not change is the process. The price is confirmed before any work starts. If the scope changes during the visit, we explain why and confirm the new price before proceeding.
Call us at (707) 892-4623 and we will talk through what the job involves and what it is likely to cost.
We serve St. Helena and the surrounding area throughout Napa County, including Deer Park, Rutherford, Angwin, Kenwood, and Calistoga. Residential homes, rental properties, and commercial buildings across these communities are all within our service area. If you are not sure whether your address is covered, call and ask.
Older homes in this area were often built without central air conditioning and sometimes with ductwork that was sized for heating only. That affects which cooling options make practical sense. A ductless mini-split system is often the most straightforward path for a home without existing ducts, while homes with ductwork in reasonable condition may be good candidates for a central system. The visit covers both the equipment and the distribution so you get a complete picture before any decision is made.
If the air handler, the ductwork, or other components are located in an attic or a crawl space, access to those areas is part of the visit. Let us know when you call if access is difficult, requires a ladder, or has any restrictions, so we can confirm the visit is scoped correctly and bring what is needed.
Yes. When you call and describe what the system is doing, the person who answers can help you understand whether a visit is warranted and what it is likely to involve. That conversation is part of how we scope the job.
Call us at (707) 892-4623 and we will help you figure out the right next step.
Heat pumps move heat rather than generate it, which makes them efficient across the mild temperature range that covers most of this region's heating season. For a home replacing an aging gas furnace, a heat pump handles both heating and cooling from a single system. For a home without existing ductwork, a mini-split heat pump is a practical alternative. We size the system to the home and confirm the scope before installation is scheduled.
Yes. When you call, let us know the property is occupied and we will schedule the visit with that in mind. The scope and timing are confirmed before anyone comes out, so the tenant is not caught off guard. If the system is completely down and the tenant has no heat or cooling, call us and describe the situation. We will treat it accordingly.
Call us and describe what the system is doing. If the symptom matches what was repaired, we will assess whether the repair needs to be revisited. If the symptom points to a different cause, the diagnostic covers that separately. We do not walk away from a job and leave a customer without a clear path forward.
Someone needs to provide access to the equipment, but that does not have to be the property owner. A tenant who can let the technician in and provide access to the air handler, the outdoor unit, and any relevant areas of the home is sufficient. If access arrangements are complicated, let us know when you call and we will work through the logistics.
Yes. Landlords and property managers with multiple properties can call to discuss what a maintenance arrangement looks like across their portfolio. We handle the scheduling and keep track of which systems have been serviced.
Call us at (707) 892-4623 to talk through what makes sense for your situation.
A system that is struggling, making a new noise, or failing to keep up with the temperature is telling you something.
Call Windsor HVAC Company at (707) 892-4623 and we will come out and look at it.
We are available every day from 7:30 AM to 10:00 PM. One number. One call. One HVAC tech at your door.
We serve these towns nearby as well: Calistoga, Sonoma, Larkfield-Wikiup, Rohnert Park.
Everywhere else we go is in our full area list.
From a quick repair call to a full system replacement, we cover the heating and cooling work that St. Helena and Napa County homes actually need. The list below breaks down each service by what it covers, who it fits best, and a practical note worth knowing before you call. If you have a question about a specific situation, call us and we will talk through what makes sense for your home or building.
| Service Type | What the Service Includes | When You Need It | Helpful Details |
|---|---|---|---|
| First-Time AC & Ductless Cooling Installation |
| Homes built without central air conditioning that are adding cooling for the first time | A home with no duct system, or with ducts not worth extending, is often a better fit for a ductless mini-split than for a new central system. |
| Seasonal Maintenance & Tune-Ups |
| Homeowners and property managers who want to catch small problems before they become emergency calls | For landlords managing multiple units, scheduled maintenance is a practical way to stay ahead of tenant calls and extend equipment life. |
| HVAC System Installation & ReplacementMost Popular |
| Homeowners, landlords, and property managers replacing aging or failed equipment | Load calculations determine the right equipment size for the space. Undersizing and oversizing both cause comfort and efficiency problems. |
Call us to talk through your situation and get a quote on the work your home or building needs.
(707) 892-4623