Updated: Jul 06, 2026
Location and Projects
Address
Po Box 1644, Longmont, CO, 80501
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Efficient Systems HVAC/Mechanical Contractor
Efficient Systems LLC, Longmont, Po Box 1644, Longmont, CO (Owned by: Carl Clausen) holds a Mechanical license and 3 other licenses according to the Thornton license board.
Their BuildZoom score of 93 ranks in the top 27% of 55,949 Colorado licensed contractors.
Their license was verified as active when we last checked. If you are thinking of hiring Efficient Systems LLC, we recommend double-checking their license status with the license board and using our bidding system to get competitive quotes.
Efficient Systems LLC Contact Information
Phone Number: (303) 667-5125
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Address: Po Box 1644, Longmont, CO 80501
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Building Permits by Efficient Systems LLC
This is a sample of this contractor's permits. Click here to access their complete permit history.
New single family dwelling w attached garage and carport (spr-15-0013/md-17-0005) the proposed square footage in bp plans (3 654 sq ft) exceed what was permitted in the dl (3 588 sq ft) however the amount is under the current psm and will be approved as proposed (psm report attached in documents)
Valuation:
$400,000
Permit #:
BP-17-1007
Status:
complete
Fee:
$14,945
Permit Type:
N/A
Building Type:
N/A
Basement finish
Valuation:
N/A
Permit #:
BPR-011175-2019
Status:
final
Fee:
N/A
Permit Type:
Basement finish
Building Type:
N/A
Basement finish
Valuation:
N/A
Permit #:
BPR-012100-2019
Status:
final
Fee:
N/A
Permit Type:
Basement finish
Building Type:
N/A
Addition of 971 sq. ft. - consisting of master bedroom and bathroom new foyer laundry room and powder room
Valuation:
N/A
Permit #:
B201804356
Status:
complete
Fee:
$4,384
Permit Type:
N/A
Building Type:
N/A
Basement fin - finish 460 sf of basement space
Valuation:
$18,000
Permit #:
16-2646
Status:
final
Fee:
$871
Permit Type:
Building
Building Type:
N/A
Plumbing/water heater: replace water heater with 40 gallon
Valuation:
$500
Permit #:
13-1095
Status:
final
Fee:
$50
Permit Type:
Water heater
Building Type:
N/A
Mechanical/furnace: install gas furnace 70 000 btu's 80%
Valuation:
$1,600
Permit #:
13-1096
Status:
final
Fee:
$91
Permit Type:
Furnace
Building Type:
N/A
Basement finish
Valuation:
N/A
Permit #:
BP-13-01802
Status:
final
Fee:
N/A
Permit Type:
Basement finish
Building Type:
N/A
Install furnace 100k btu
Valuation:
$3,100
Permit #:
BP-10-0607
Status:
complete
Fee:
$122
Permit Type:
N/A
Building Type:
N/A
Install ductwork in addition eficient systems llc. 667-5125
Valuation:
N/A
Permit #:
04100064 00000MP
Status:
complete
Fee:
N/A
Permit Type:
Addition
Building Type:
Residential
Furnace replacement
Valuation:
$3,000
Permit #:
B201807752
Status:
expired
Fee:
$108
Permit Type:
N/A
Building Type:
N/A
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Efficient Systems LLC Reviews
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Verified License
BuildZoom confirmed this contractor's license
Efficient Systems LLC License info
Verified License
| License # | 25343 |
| Status | Active |
| City | Thornton |
| Type | Mechanical |
- BuildZoom has not verified this license since September, 2015.
Verify this license's status for Efficient Systems LLC at the Thornton City Development Contractor License.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | CON-10-0097 |
| Status | Inactive |
| County | Boulder County |
| Type | Residential Mechanical Installations And Repair |
- According to the Boulder County Land Use Department, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Efficient Systems LLC at the Boulder County Land Use Department.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | 130331035 |
| Status | Inactive |
| City | Westminster |
| Type | General Contractor |
- According to the City of Westminster, Colorado, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Efficient Systems LLC at the City of Westminster, Colorado.
This is a sample of licensing data; click here to access a complete history.
Inactive License
| License # | LCC2015059344 |
| Status | Inactive |
| City | Thornton |
| Type | Class D Mechanical |
- According to the Thornton City Development Contractor License, the status of this license was at one point cancelled. However, this information may have changed. If this is your business, please update your license status.
Check this license's status for Efficient Systems LLC at the Thornton City Development Contractor License.
This is a sample of licensing data; click here to access a complete history.
93
BuildZoom Score
10
Permits
- Building permit records show that Efficient Systems LLC has worked on 10 permitted projects.
Efficient Systems LLC Employees
CC
Carl Clausen
Owner