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A ground wire is not required for GFCI to work. A ground is a third wire in an outlet in addition to the live and neutral wires. It serves as an escape conduit for electricity in case of a short circuit. If a ground wire is present, installers should connect it to the appropriate terminal. Otherwise, a GFCI will work fine without it.

To upgrade electrical systems in older homes, you might need to reroute new wires with lath and plaster walls. That’s because it’s more challenging to get inside the walls of an older home compared to a modern home, which usually uses drywall. But there are easier ways to level up your electrical game in an older home. For instance, you can swap out an old furnace for a new electric heat pump, or you could use a heat pump for water heating.

It can be safe to buy or live in a house with knob and tube (K&T) wiring, but only if the system is in good condition, functional, and has been thoroughly inspected and approved by a licensed electrician. Never purchase a home with K&T wiring without getting a professional electrical inspection first.

Key considerations include:

• Safety and Condition: An inspector will verify that the wiring is safe and has not deteriorated. Over time, the insulation can wear away, leaving exposed wires that pose a significant fire or shock hazard.

• System Capacity: The electrical service should be at least 60 amps. However, even at this capacity, K&T systems often struggle to handle the demands of modern appliances and electronics.

• Lack of Grounding: Knob and tube wiring is an ungrounded system, which is a safety concern for many modern devices.

• Ongoing Maintenance: If you live in a home with K&T wiring, it's recommended to have it inspected by an electrician every one to two years to ensure it remains in safe working order.

Ultimately, any inspection or modification of a knob and tube system should always be performed by a certified professional.

Hiring a professional for attic fan installation or replacement is highly recommended to ensure safety, proper ventilation, and effectiveness without damaging your roof. The type of professional needed can vary based on the fan type and project specifics.

• HVAC Technicians: They understand airflow and ventilation principles, making them well-suited for the job.

• Roofers: Experienced roofers are ideal for roof-mounted fans, as they can ensure a watertight installation.

• Electricians: A licensed electrician is essential if new wiring is needed, or for replacing solar or electric attic fans to safely handle the electrical connections.

• Carpenters: They may be needed to install gable vent fans or to ensure a new fan fits the existing structure correctly.

• Handyperson: For a simple replacement of an old fan with no wiring or structural modifications, a handyperson might be an option.