Seattle Roof Top Unit (RTU) Services — Installation & Repair

A Higher Standard Company. The GREENTOP Difference

Keep your roof top unit (RTU) running like new with commercial repair & maintenance services from our skilled factory trained technicians. No matter who installed your commercial roof top unit, our team can deliver quality repair and maintenance services at the right price. To set-up a commercial repair or maintenance service visit, fill out the form below, give us a call or send us a text.

RTU Installation

GREENTOP HVAC Heating & Cooling has installed dozens of rooftop units (RTUs) for retail, office, and light-industrial buildings, and we bring that experience to every project. Our team handles the entire scope — site assessment, load calculations, permitting, crane lifts, curb adapters, duct transitions, gas/electrical hookups, economizers, and controls integration — and then commissions each system for correct airflow, refrigerant charge, and safety. We schedule around your operations, maintain a tidy jobsite, remove all construction debris, and back the work with clear warranties and preventive maintenance plans to keep your RTUs running efficiently for years.

Comprehensive RTU Repair Components

Our certified technicians expertly diagnose and repair all critical RTU components to restore optimal performance:

Electrical System Repairs

Control Boards: Diagnosing and replacing faulty circuit boards damaged by power surges
Contactors & Relays: Repairing arc-damaged components causing system failures
Capacitors: Replacing swollen or leaking start/run capacitors
Wiring Harnesses: Repairing rodent-damaged or corroded wiring connections

Mechanical Component Repairs

Compressors: Repairing valve issues, replacing burnt windings, and addressing short cycling
Fan Motors: Replacing worn bearings, repairing damaged windings, and balancing assemblies
Blower Wheels: Realigning and balancing unbalanced wheels causing vibration noise
Belts & Pulleys: Replacing worn belts and aligning pulley systems

Refrigeration System Repairs

Coil Leaks: Locating and repairing evaporator/condenser coil leaks with pressure testing
Expansion Valves: Replacing stuck or malfunctioning metering devices
Reversing Valves: Repairing valves stuck in heating/cooling mode
Refrigerant Issues: Correcting under/over-charged systems and removing contaminants

Airflow & Ventilation Repairs

Damper Motors: Replacing failed actuators in economizer systems
Heat Exchangers: Repairing cracks and corrosion in heat transfer surfaces
Ductwork: Sealing leaks and repairing damaged insulation in rooftop ducts
Filters & Screens: Replacing damaged filter racks and airflow sensors

Control System Repairs

Thermostats: Recalibrating and replacing inaccurate temperature sensors
Pressure Switches: Repairing stuck or failed safety controls
Communication Systems: Fixing BAS integration and network connectivity issues
VFD Drives: Troubleshooting and replacing faulty variable frequency drives

2794 clients have trusted us in Seattle, WA and nearby areas

The owner and his team actually listen to their customers and respond with empathy and genuine interest in providing the best possible solution for my/your situation. The owner went out of his way to schedule a furnace replacement immediately, even though this required an employee to report to work on a day off. I have been impressed with the owner's resolve and his high level of respect toward me and his commitment to quality service. I highly recommend Greentop Heating for all of your furnace needs. Steve Part II - Greentop installed a new high quality American Standard gas furnace in my home yesterday. I had a couple of requests for improvements in the original air flow design. The installers showed up on time and performed exceptional work. The owner personally followed up with me today to make sure I am happy. MOST IMPORTANT - from the top down, GREENTOP IS HONEST and OPERATES with INTEGRITY. Honesty is so rare in this industry! You can trust the owner and their work. I am a contractor who fully understands the challenges homeowners face...especially vulnerable people. YOU CAN TRUST GREENTOP FOR EXCEPTIONAL WORK AND VALUE

I recently had Greentop replace my aging furnace. Probably a simple job - just swap out a gas, hot-air furnace with minimal ducting, electrical and plumbing work. The process was totally low-hassle, with a good price too! Since my job was fairly simple, the quote was done based on a few photos showing the old furnace location and specification label. I had a question on my quote, and Andres was prompt in following up. The install crew showed up on time, and did a neat job of it. Initially 2 guys to man handle the old furnace out and the new one into place. Then Oleksii finished up all of the hookups, including some new ductwork, and cleaned up well. 10 days later and everything is working great.

Our heater stopped working and we were able to get a next day appointment. Service was prompt and overall price was very reasonable. Our heat was back on that same day. Would definitely work with these folks again.

We've been wanting to get mini splits installed for four years now. We did a lot of researched and obtained quotes from many companies. We chose GreenTop and are so glad we did! The entire process was seamless, fast, and efficient from start to finish. Andres provided us with a very reasonable quote and was incredibly patient and thorough with my many questions. He was able to schedule us within two weeks which was very exciting and even adjusted two of the mini splits we were getting at the last minute when we decided we needed a bit more power in the living rooms. Also their quote was very clear and detailed and broken down into separate line items so you can see what each part of the project costs which I appreciated. The install team (Hena and Oleksii were two of them) was fantastic. They coordinated absolutely everything and were able to run the refrigerant lines through our attic which we are really happy about. The units work beautifully and are amazingly quiet and powerful. Long story short we are incredibly happy with the result and are very grateful to GreenTop. Thank you so much!

All the people that worked in this project did a great job. I am very pleased with the service given to me by Andres who assisted me from beginning to end. Always pleasant and polite.

From start to finish my experience with Greentop Heating was great. The estimator was professional and thorough. The installation staff very qualified and courteous and the communication following installation to ensure everything went well was also very good. This company is worth checking out as they also gave me the best price. That tells me they are a well run company at all levels.

Fantastic service - after moving recently the AC + heater worked alright, but, by the second summer - everything powered up but no cooling. After looking at the permitting and contacting the original installer, they quoted close to 2x what Greentop wound up doing the work for. Within 3 hours we had two leaks patched, ID'ed multiple faulty connectors, and our AC cools significantly faster.

We had to replace our old furnace and contacted Greentop Heating. They are very professional and friendly. The estimator did a great job explaining options and costs. Quick scheduling for install after we accepted the bid. The technicians that did the removal of the old furnace and install of the new one where great, again very professional and friendly. A 5 -star experience for us working with Greentop Heating.

We had these guys install a new heat pump. They were awesome! Showed up on time, quote was reasonable and the inspector even complimented their work! I’d highly recommend them!