The modern internet has unlocked the “do it yourself” realm to everybody.
Before YouTube and Google, most DIY projects were done from an instruction manual.
Now, even an illiterate person can engage in DIY projects via video guides. There are some projects that should not be attempted by a non-professional or inexperienced person. Most small cosmetic DIY activities for HVAC can be done by anybody, an example of this would be painting your air duct vents. Other simple tasks like draining your water heater, cleaning out dust from the intake filter area, programming a smart thermostat, and installing aroma diffusers into a duct network can be done by most people as well. Some jobs that require messing with wires, plumbing, or gas lines should be reserved for professionals but would be safe for an experienced handyman to try. If you see a DIY video of somebody messing around with refrigerants, do not attempt to imitate their work. Most states require a licensed refrigeration technician to handle the draining and refilling of these substances on HVAC systems. Several refrigerants are being phased out due to their ozone layer depletion effects. Caution yourself when contemplating electrical work or full replacements on your HVAC system. Have you ever installed a central or forced heating system? If master electricians get shocked regularly, what are the odds of an amateur without supervision or guidance will be shocked? HVAC technicians usually have schooling, a certification they must attain to be employed as an HVAC tech, and on the job training to some degree before they are trusted to install an entire cooling/heating system. My local community college now offers an A.S. degree in HVAC technology because so much new technology is involved with modern systems.