Commercial · Design-Build
Design-build HVAC for Central Washington businesses
Design-build puts the responsibility for the finished system in one place. In a traditional build, the designer is separated from the people who install the equipment, and that gap adds complexity and communication problems that increase cost and time. With All Seasons, the design, the installation and the performance all rest with us.
How it benefits you
Made, installed and serviced by the people who designed it
Everything we list below rests on one thing: practical experience. Making HVAC systems, installing them, servicing them and maintaining them is real-world work, not an abstract design concept. The vast majority of mechanical engineers have never put a hammer to installing, servicing or maintaining these systems.
How far would you trust a doctor fresh out of school if he or she never practiced on a single patient? There is a level of competency beyond books that you only gain by performing the work successfully over and over again.

A design-build contractor provides one service in which the design, the installation and the performance of the product all rest with the contractor. On this page, that contractor is All Seasons Heating and Air Conditioning.
What you can hold us to
The benefits of design-build with All Seasons
Design-build contractors are held to high ethical standards. These are ours, in plain terms.
Design fees: $0
Our engineering or design fees are $0 when you accept our service. Engineering fees can add substantial expense to a project.
You are the client
We work directly for you, not an architect or contractor, so we pay attention to your specific needs and desires.
One name on the job
We take full responsibility and accountability for the product. There is no finger-pointing at someone else if something is not quite right.
Code and law, met
We hold to the high ethical standards required of design-build contractors. We never skirt the rules, and we meet the code, legal and ethical requirements for all licensed services.
Plain dealing
We are honest and transparent, and we never use fraud or deliberately false or misleading statements or materials.
Conflicts disclosed
We avoid conflicts of interest. If one arises, we disclose it quickly and work to resolve it professionally.
No bribes
We do not accept or give bribes.
Full scope, warranty included
We honor our contractual agreements and fulfill the entire scope of our work. We will never alter the scope, quality or objectives without your consent, and that promise includes the warranty after the service.
Safety first
We vigorously protect the safety of our workers, the public and the client.
Confidences kept
We do not violate confidential or intellectual property.
Our process
Calculated, drawn and fabricated under one roof
Heat loss and gain
Our designs are based on room-by-room heat loss and gain calculations, run in industry-leading design software by Carrier, Wrightsoft and Loop CAD.
Permit drawings
We produce AutoCAD drawings in-house to meet the application requirements for permits.
Built to SMACNA
All our systems are built in-house to SMACNA standards and current code requirements.

Custom sheet metal is fast becoming a lost art
Our full-time fabricator, Greg Lunning, blends plasma table accuracy with old-school artistry, creating build-to-measure fittings for any project we design.
We limit flex-duct to its proper use, three to five feet on terminating branch runs. The rest of the system is smooth galvanized sheet metal with low static-inducing fittings, sealed to meet or exceed the mechanical code, and insulated beyond the conditioned envelope.
Schedule of work
Design-build HVAC in the Yakima area
Offices, plants, hotels, theaters, a winery and a wind farm office. This is our own published list of design-build projects.
S-1Offices and plants
- Allan Bros' Corporate OfficeNaches
- Allan Bros' Production OfficeNaches
- Borton Fruit Production Office
- DK Fabrication Office
- NEPA Pallet & Container Office & Plant
- Korblu Manufacturing Office & Plant
S-2Business and industry
- Macro Plastics
- Mountain States Construction OfficeSunnyside
- TreeTop Prosser OfficeProsser
- CPC Corporate OfficeTieton
- Wild Horse Wind Farm OfficeEllensburg
- ComtronicsCle Elum
S-3Hotels
- Holiday Inn Yakima
- Holiday Inn Ellensburg
- Holiday Inn RichlandRichland
- Ramada by Wyndham, Moses Lake
- Wingate by Wyndham, Moses Lake
S-4Food and drink
- Cowiche Canyon Kitchen & Ice House Bar
- Miners Drive Inn
- Snipes Mountain BrewerySunnyside
- Mary Hill WineryGoldendale
S-5Screens, sport and retail
- Majestic Theater
- Yakima Cinema
- Grand Meridian CinemaEllensburg
- Yakima Athletic Club
- Adventure RV
S-6Health and finance
- Orchard Hills Dentistry
- Boysmith Vision CenterEllensburg
- Lower Valley Credit UnionGrandview
Request our design-build services
Tell us about the building
If your company is interested in custom design-build work, we are happy to assist you in any way. Give us a call or request service online. Commercial equipment financing is available.
See also commercial financing and our other commercial services.

