Essential Tips on When to Turn on Your Air Conditioner After Installation
                     How Long to 
Wait Before 
Turning
on Air 
Conditioner 
After 
Installation
Factors Affecting Installation 
TUniimt Teype & Size
Split systems, ducted systems, and window units each have 
different installation requirements. Larger capacity units typically 
require more time to install properly.
Installation Complexity
Pre-existing ductwork condition, need for modifications, 
and the complexity of refrigerant line routing can 
significantly extend installation time.
Location & Accessibility
Difficult-to-access installation sites, such as lofts or high 
external walls, can increase the time required. Properties with 
limited access may present additional challenges.
Seasonal Demand
Summer months see peak demand for AC installation, potentially 
affecting scheduling and extending the wait time for professional 
installers to complete your project.
AC Unit Types and Installation 
Times
AC System Type Typical Installation Complexity Level Key Installation 
Duration Elements
Split Systems 4-8 hours per unit Moderate Indoor unit, outdoor unit, 
refrigerant lines, drainage
Ducted Systems 3-5 days High Ductwork 
installation/modification, multiple 
outlets, central unit
Window Units 1-2 hours Low Window bracket, insulation, 
electrical connection
Why Wait Before 
Turning On Your New 
ATeCch?nical 
CAftoer ninsstailladtioen rora retloicoatinons, air conditioning systems 
require a settling period before operation. This crucial 
waiting time serves several important technical purposes:
• Allows refrigerant to stabilise and settle within the system
• Ensures compressor oil returns to its proper location
• Prevents compressor damage from improper lubrication
• Allows for proper pressure equalisation throughout the system
Recommended Waiting Times Before 
Use
1 30 Minutes
Minimum wait time for units that have been transported and placed 
upright. This allows for basic refrigerant stabilisation.
2 2 Hours
Recommended minimum wait for window units 
and smaller split systems after proper installation.
3 12 Hours
Ideal wait time for most residential split systems to ensure 
proper oil return and system stabilisation.
4 24 Hours
Maximum recommended wait for larger systems or units that were 
transported horizontally. Some manufacturers specifically advise this 
duration.
Risks of Turning On 
AC Too Soon Potential 
CCoomnprseessqoru Deanmacgees
Premature operation can cause oil displacement, leading 
to inadequate lubrication and potentially catastrophic 
compressor failure.
Reduced System Efficiency
Even minor damage from early startup can decrease energy 
efficiency, increasing operating costs over the system's lifetime.
Warranty 
Implications
Many manufacturers may void warranty coverage if damage 
results from operation before recommended settling periods.
Summary & Best 
Practices
Complete Installation
Expect installations to take between 4-8 hours for standard 
units and up to 5 days for complete ducted systems.
Allow Proper Settling Time
Wait the manufacturer-recommended time (30 minutes to 
24 hours) for refrigerant and oil to properly settle.
Follow Expert Guidance
Adhere to the specific instructions from your unit's manual 
and professional installer's advice.
Enjoy Optimal Performance
Proper waiting ensures long-term AC performance, efficiency, 
and reliability for years to come.
Contact Us
Total Comfort Cooling & 
Heating Inc
1207 Enterprise Dr
Port Charlotte, FL 33953
(941) 629-6222
[email protected]
TotalComfortCooling.com