# Mechanical (HVAC) permit MEC2026-01689 at 3990 Darley Ave, Boulder

Boulder Planning and Development Services permit MEC2026-01689: issued Sep 18, 2026 for mechanical (hvac) work at 3990 Darley Ave. Installing Mitsubishi 2 zone 20k (2 wall mounted units) and Mitsubishi 2 zone 30K (1 4 way ceiling cassette, 1 wall mount) 1-MXZ-2D20NLHZ 20K BTU 19.3 SEER2 Heat Pump 1-MXZ-3D30NLHZ 30K BTU 20 SEER2 Heat Pump 2-MSZ-GX12NL Wall Mounts 1-MSZ-GX09NL Wall Mount 1-SLZ-AF18NL Ceiling Cassette 1-Level 1 Electrical Services 1-Level 2 Electrical Services PLEASE NOTE: APPLICABLE ONLY TO SYSTEMS WITH FUEL BURNING APPLIANCES: All new plastic glued vents for fuel burning appliances must undergo pressure testing. To facilitate the inspection process, please provide photographic evidence of the pressure test directly to the assigned inspector on the day the rough mechanical inspection is scheduled. Approved tests: 10 ft water test, 5 PSI positive pressure, or Negative 5 psi air pressure test for 15 Minutes.

- Permit number: MEC2026-01689
- Issued: Sep 18, 2026
- Type of work: Mechanical (HVAC) (city: Mechanical Permit, Mechanical with Electrical)
- Status: Issued (city: Issued)
- Reported cost: $44,529
- ZIP code: 80305
- All permits at this address: https://nearbypermits.com/boulder/address/3990-darley-ave/

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Source: Boulder Planning and Development Services permit data (https://www.arcgis.com/home/item.html?id=e3ff6248e4a547bcba31025d2c5c9fee). Checked 2026-10-08 02:25 UTC. Nearby Permits, https://nearbypermits.com. JSON API and MCP server: https://nearbypermits.com/developers/

Every permit at 3990 Darley Ave: https://nearbypermits.com/boulder/address/3990-darley-ave/