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Commercial HVAC for the Industries We Serve
Serving Modesto, Manteca and Riverbank in the Central Valley
NATECertified technicians on a licensed, insured team.
37Years our owner has worked in HVAC.
15–20 milesOur regular commercial service radius from Modesto.
One Contractor for Every Building You Run
Finding HVAC for businesses in Modesto shouldn't mean calling one company for repairs and another for new equipment. Dycus Heating and Air Conditioning covers both, plus the upkeep in between. Valley businesses have called us for all of it since 2001.
That might mean a quarterly tune-up for a restaurant, a new rooftop unit for a store or a system that gives every office its own setting. We fix, replace and maintain commercial heating, cooling and fresh air systems for every kind of business below.
The state licenses us, and Daikin has certified our team on its VRV systems. The license covers a single rooftop unit over a store, and the Daikin certification covers VRF across a whole office floor.
365Days Availability
100%Local Technicians
25Years of Experience
Standards That Hold in Every Industry
Check Our License, Training and Pricing
Licensed and Insured
Before you hire Dycus Heating and Air Conditioning, you can check our standing for yourself. Look us up on the Contractors State License Board site. You'll see the license status and workers' comp coverage.
Independently Tested Technicians
Our technicians hold North American Technician Excellence (NATE) certification, which no California license requires. Each one chose to sit an independent exam, so the person on your roof brings proven skills as well as a license.
$169 Commercial Diagnostic
A commercial HVAC diagnostic for businesses in Modesto costs $169, whatever the building does. So a manager with a store, an office and a restaurant knows the first cost before we arrive.
How Each Industry Uses Commercial HVAC
Every industry puts its own strain on a commercial HVAC system. Below, we break down commercial HVAC by industry, with the problem each one faces, how our team helps and the facts behind our approach.
Office Buildings
A meeting room packed for an hour heats up fast, while the private offices next door stay cold. The complaints land on the building manager. We find the cause and fix it, so every room holds its setting.
Offices use about 16% of all energy in U.S. commercial buildings, per the U.S. Energy Information Administration (2018). Our technicians measure the airflow to each room. Then we add zoning or a variable refrigerant flow (VRF) system, so the energy you pay for reaches the rooms that need it.
Property Managers and Rental Properties
A failed unit at a rental means tenant calls, and a surprise replacement can wreck the year's budget. We keep every unit in your portfolio on one service plan, so you see replacements coming long before they're urgent.
California law requires working heat in rental homes under Civil Code 1941.1, so a winter breakdown can't wait. Our commercial HVAC maintenance agreement covers rooftop units and split systems alike. After each round, you get each unit's condition in plain terms.
Retail Stores
A stuffy store can send shoppers out the door sooner. The rooftop units above the aisles also run every hour you're open. We keep that commercial air conditioning steady through long hours and busy seasons.
Stores and shopping centers hold 11% of U.S. commercial floor space but use 14% of its energy, per the U.S. Energy Information Administration (2018). Our technicians check belts and fan motors, then clean the coils. If a unit stops, our commercial HVAC repair team finds the cause.
Schools
Stale air in a packed classroom can make it harder for students to focus, and cooling alone doesn't fix it. We keep the fresh air side and the cooling side working through the school year.
California's school ventilation program ties classroom airflow to the state energy code. It also calls for MERV 13 filters, a finer grade, where a system can take them. We check that outdoor air reaches every classroom, and our commercial HVAC installation and replacement team sizes new units for finer filters.
Restaurants
A walk-in cooler that runs warm puts food at risk, and a hot kitchen wears out the staff. We service the refrigeration and the rooftop unit together, so one visit covers both.
Restaurants use more electricity on refrigeration than on anything else, says ENERGY STAR. For restaurant HVAC and commercial refrigeration in Modesto, Dycus Heating and Air Conditioning checks door seals, fans and coils, and changes grease-clogged kitchen filters more often.
Data Centers
Servers never stop making heat, so one failed cooling unit can put the whole room at risk. We set up cooling that runs around the clock and holds the room in a safe range.
Data centers use 10 to 50 times the energy per square foot of a typical office, says the U.S. Department of Energy. We install server room cooling in Modesto with a second unit that can carry the load alone. The units take turns, so the backup stays tested.
Running a smaller shop, office or suite? Our light commercial HVAC page covers that work. For any other building, tell us what's on the roof and how the space is used, and we'll say honestly if we're the right fit.
How Our Commercial HVAC Service Works
HVAC for businesses in Modesto follows four simple steps, whatever your industry.
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Tell us about your industry
Share what your business does, when it gets busiest and what equipment runs your building.
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We inspect your building
A technician checks every unit, from the rooftop to the walk-in cooler or server room if you have one.
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A plan for your calendar
We price every workable option. We aim to put big jobs in your industry's quiet months.
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Upkeep built for your industry
Each visit lands at a quiet time for your business, and the key one comes right before your busy season.
Planning Work Around Your Industry's Calendar
Every industry has quiet months when bigger commercial HVAC work causes the least disruption. Choose your type of building and the job you need, and the planner shows when to schedule it. The months shown are typical windows we suggest, and we confirm the timing for each site.
What kind of building do you run?
What's the job?
It's , so you're in the window now. Good time to call.
It's . Your next window opens in , so now is the time to plan it.
Mild months suit an office changeover.
From October to April, a day without cooling is easier on staff.
Pre-season visits in March and October.
Of your quarterly visits, these two ready the system for cooling and heating season.
Replace before the summer rush.
November through April works best, and empty units can be swapped between tenants any month.
One round each quarter, every site.
January, April, July and October rounds keep every unit in the portfolio on a short cycle.
Post-holiday months suit a changeover.
January through March keeps work away from the busy fall and holiday selling months.
April and September visits matter most.
One gets the units ready for the long cooling season, and one checks the wear as it ends.
Summer break gives you the window.
Empty classrooms in June and July give crews room to work, so settle the plan by spring.
Spring and winter breaks suit check-ups.
With students away, technicians reach every classroom unit without stopping a single lesson.
Late winter suits a kitchen changeover.
January through March, booked before opening or on the day you're closed.
A visit every three months.
The April visit gets the kitchen ventilation and walk-in cooler ready for summer.
Cooler months make changeovers safe.
Swap units while the backup can carry the room alone, and keep June through September clear.
April and October capacity checks.
One confirms cooling capacity before the heat, and one reviews what summer wore down.
Any month works for a repair.
On weekdays, a repair call placed early often gets a technician out the same day. Weekend failures get a technician too, as long as you call before 9 PM.
Talk to Our Commercial HVAC Team Today
Commercial HVAC Help From the First Call
Call any weekday from 7 AM and tell us what your business does and what the system is doing. Whether it's a repair, a maintenance agreement or a new rooftop unit, we'll book the right visit before you hang up. Quick questions are welcome too, even before anything breaks.
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Multi-Site Visits Planned Together
Running stores, offices or rentals in more than one town? List every site on the first call. We'll group the visits by area and keep every site on one schedule, with one contractor and the same standard at every address.
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Quotes Sent to Your Approver
Commercial quotes often wait on an owner, a landlord or a head office. Tell us who signs off, and we'll send the options and prices straight to them, with a plain reason for each, so the decision moves faster.
Local Contractors Who Know the Valley
We're based in Modesto and work across Stanislaus and San Joaquin counties. Valley heat and farm dust are hard on rooftop units, and we plan upkeep around both. Each site past about 20 miles from Modesto carries an out-of-area fee, flagged when you list your sites. Every call reaches a local team.
Customers Who Keep Calling Us Back
Commercial work is a long relationship. The clearest proof is a customer who keeps calling. Here's what Central Valley customers wrote on Google, and the themes that come up often.
Common themes in our Google reviews
- Technicians who explain the work
- Honest, responsive service
- Quick help when something fails
- Customers who stay for years
"We've been with Dycus for many years and they never disappointed with their services."
Herb C., Google review
Years of steady service
"Been doing business with Dycus for years."
Ron D., Google review
A long-time customer
Commercial HVAC Costs, Upkeep and System Guides
Commercial buyers do their homework before they call, and the Dycus Heating and Air Conditioning blog is built for that stage. It covers costs, upkeep and system choices for every kind of building. Here are the newest HVAC posts for businesses in Modesto.
- Uneven Office Temperatures in Modesto: Can a VRF System Fix Them?
Office buildings
- How Much Does Strip Mall HVAC Replacement Cost in Modesto Between Tenants?
Retail and rental property
- Replacing Rooftop Units on a Modesto Building: All at Once or One at a Time?
Buildings with several rooftop units
Commercial HVAC Answers for Your Industry
Can skipping maintenance void a commercial HVAC warranty?
It can. Many equipment makers tie their warranty to proper installation and regular upkeep. Some ask for service records before they approve a claim. Keep a dated record of every visit, and read the warranty's upkeep terms so you know what it asks for.
What does an economizer do on a rooftop unit?
An economizer lets a rooftop unit cool with outside air when it's cool enough outdoors, so the compressor can rest. In the Central Valley, that means many cool mornings and evenings. A stuck economizer wastes energy or lets hot air in, so it's worth checking at every maintenance visit.
How cold should a restaurant walk-in cooler be?
California's Retail Food Code says cold food must be held at 41°F or below. Many kitchens set the walk-in a few degrees colder for a margin when the door opens during a rush. Keep a thermometer inside, and book a service visit if it keeps reading warm.
What is the safe temperature range for a server room?
ASHRAE, the group behind most HVAC standards, recommends 64.4°F to 80.6°F for the air going into servers. Many rooms run near the cooler end to stay safe on hot afternoons. Humidity matters too. Very dry air raises static risk, and very damp air can corrode parts.
What is the difference between commercial and industrial HVAC?
Commercial HVAC heats and cools places where people work, shop and learn. Industrial HVAC serves factories and plants. There, the system often runs part of a process, not just comfort. Dycus Heating and Air Conditioning is a commercial HVAC company that works on commercial and light commercial buildings.
Does commercial HVAC maintenance mean closing the business?
Usually not. Most upkeep happens on the roof or in a mechanical room, and each unit is off only while a technician works on it. Visits can often be timed for a slow part of the day, so staff and customers carry on as usual.
Schedule Service for Your Building
Every commercial HVAC job starts with one short call to Dycus Heating and Air Conditioning. Tell us about your building and what it needs, and we'll find a time that works for you.