The answer to 'how often to replace installation' is that the installation (insulation) in your home should generally be replaced every 15-20 years. Insulation can degrade over time, becoming less effective at trapping heat and maintaining comfortable temperatures in your home. Factors like climate, home age, and usage can impact the lifespan of insulation.
If your home is older or you notice drafts, uneven temperatures, or higher energy bills, it may be time to have a professional HVAC technician inspect your insulation and recommend replacement. Proper insulation is important for energy efficiency and comfort, so keeping up with regular maintenance and replacement is key.