ADVANCED MECHANICAL SYS INC
Spokane Valley, WA
HVAC and mechanical contractor based in Spokane Valley, WA, operating since 1984. The company specializes in residential and commercial heating, ventilation, air conditioning, ductwork, and electrical work, serving greater Spokane and North Idaho. Licensed as a Construction Contractor, Electrical Contractor, and General Contractor in Washington and Idaho. Verified active WA contractor license ADVANMS008C8 (UBI 600551795) registered since 2000 with principal Greg Date.
License facts verified August 22, 2026 · Web research from August 22, 2026. Reports refresh automatically as they age.
Hard facts
- WA contractor registrationOK
ACTIVE
source ↗ — retrieved August 22, 2026
- License numberOK
ADVANMS008C8
source ↗ — retrieved August 22, 2026
- License typeOK
ELECTRICAL CONTRACTOR
source ↗ — retrieved August 22, 2026
- Registered sinceOK
2000-02-28
source ↗ — retrieved August 22, 2026
- Registration expiresOK
2026-10-16
source ↗ — retrieved August 22, 2026
- BondOK
$4,000 — Travelers Cas and Surety Co of America
Effective 2018-06-06, expires Until Canceled. Claims against the bond aren't in this dataset — check the L&I verify page.
source ↗ — retrieved August 22, 2026
- Liability insuranceCaution
Not found
No insurance on file — WA requires contractors to carry liability insurance.
source ↗ — retrieved August 22, 2026
- Business entityOK
Corporation — UBI 600551795
source ↗ — retrieved August 22, 2026
- PrincipalOK
Date, Greg
source ↗ — retrieved August 22, 2026
Reputation
Advanced Mechanical Sys Inc maintains a strong reputation as an established local HVAC contractor. The company holds an A+ rating with the Better Business Bureau and has been in business for over 40 years. Online reviews are generally positive, though a limited number of complaints have been documented.
Reviews by platform
| Platform | Rating | Reviews | Notes |
|---|---|---|---|
| Better Business Bureau (BBB) ↗ | A+ | 1 documented complaint | BBB file opened 11/3/1999. Years in business: 41 (as of research date). Business started 11/1/1984, incorporated 11/13/1984. |
| Google ↗ | 4.4 stars | 62 reviews | Directory aggregator report of Google ratings for local HVAC providers. |
| Yelp ↗ | — | — | Profile lists business owner Greg D., 14 photos, specializations in HVAC, ductwork, and electrical work. No visible star rating or review count captured in search results. |
| Angi/HomeAdvisor ↗ | 5.0 out of 5 | 1 sample review visible | Cached listing appears dated (last updated ~2018). One review praised technician John Munro. Listing notes company does not offer warranties. |
In the news
Advanced Mechanical Systems Business Spotlight ↗
Promotional business profile published November 2025 describing the company as a long-standing local HVAC contractor with headquarters at 6315 E Sharp Avenue in Spokane Valley, specializing in residential and commercial HVAC solutions with a team of skilled technicians.
Complaints
- BBB complaint from 2021 regarding heating and cooling system performance in new construction. Customer reported spending 2021 attempting to work with home builder and AMS to fix heating/cooling issues without success, with the system failing to keep the house adequately warm in winter or cool in summer. — source ↗
Home-state license
WA: ACTIVE — source ↗
Confidence is moderate-to-high that BBB, Yelp, Angi, Alignable, and other directory records refer to the same Spokane Valley entity, confirmed by matching address (6315 E Sharp Ave), phone (509-534-0547), founding year (1984), and license holder history. WA L&I official records directly verify license ADVANMS008C8 as ACTIVE with UBI 600551795 and principal Greg Date, consistent across sources. Minor inconsistency exists regarding named ownership (Robert Tallan/Greg Date per BBB vs. Sean Mccarroll per BuildZoom Idaho record)—likely reflecting different roles or qualifying parties rather than company identity discrepancy. No news coverage was found confirming this company's involvement in Spokane Complex Fire rebuild work; such a connection remains unverified. An unrelated company of similar name operates in Stow, Massachusetts and should not be confused with this Spokane Valley business.
Before you sign
Get a written, detailed contract before work starts or money changes hands
A handshake deal or a one-page estimate leaves a lot unwritten — get the full scope, price, schedule, and payment terms into one signed document. It's commonly recommended you get a written agreement that spells out the scope of work, materials, start and completion dates, total price, and the payment schedule — and that you don't let work begin, or hand over money, until both sides have signed it. If a contractor resists putting terms in writing, treat that reluctance as information in itself.
Be cautious about large upfront deposits
Asking a homeowner for a large deposit or full payment before any work begins is one of the most common patterns in post-disaster contractor scams. It's commonly recommended you keep any upfront deposit small — enough to cover initial materials or permit costs, not the bulk of the contract — and get the exact payment schedule in writing. L&I's hiring-a-contractor guidance covers current specifics; treat pressure for a large deposit as a reason to slow down.
Pay by completed milestone, never ahead of the work
Structuring payment around finished stages — foundation poured, framing complete, roof on — instead of a calendar schedule gives you leverage if something goes wrong partway through. It's commonly recommended you inspect each milestone yourself, or have someone you trust inspect it, before releasing that portion of payment. The final payment shouldn't be due until you're satisfied the work is complete and has passed any required inspections.
Get lien releases from subcontractors and suppliers before final payment
In Washington, subcontractors and material suppliers who aren't paid by your general contractor can potentially place a lien on your property, even if you already paid the general contractor in full. Before making the final payment, it's commonly recommended you ask for signed lien releases (sometimes called lien waivers) from every subcontractor and supplier who worked on the job, so you aren't at risk of paying twice for the same work.
Get a certificate of insurance that names you
A certificate of insurance from the contractor's liability insurer, ideally naming you as an additional interest, is commonly recommended before work starts — it gives you documentation of coverage if a worker is injured on your property or the contractor damages something during the rebuild. Confirm the policy is active and matches what's on file with L&I rather than taking a photocopy at face value.
Verify the license and bond yourself at L&I — don't take their word for it
Every fact in this report links back to its source so you can double-check it, and it's commonly recommended you also look the contractor up directly at L&I's own verification tool (secure.lni.wa.gov/verify) before signing anything, since license and bond status can change after this report was generated. A license number printed on a business card or truck door doesn't confirm the registration is current, active, and actually belongs to the company you're about to hire.
Ask for local references from the last two years, and call them
References from jobs completed in the last two years, ideally similar in scope to yours, are commonly recommended over older or out-of-area references — a lot can change at a company in a few years, especially one that has recently expanded into disaster-rebuild work. Call the references yourself and ask specifically about timeline, communication, change orders, and whether they'd hire the contractor again.
Never sign an assignment of insurance benefits without review
An assignment of benefits (AOB) signs over your right to your own insurance claim payout directly to the contractor — once signed, you can lose much of your ability to control or dispute how that money is handled. It's commonly recommended you have your own insurer review any assignment-of-benefits document before signing, and consider having a lawyer review it too, rather than signing one a contractor hands you on the spot.
This report was assembled automatically from public records and web sources on August 22, 2026. It may contain errors or miss information, and it can go out of date. It is not legal advice, not a recommendation for or against hiring anyone, and not affiliated with any government agency. Always verify at the linked official sources.