Replace all existing lamps with LEDs

Replace existing appliances with high-efficiency versions. E.g EnergyStar rated appliances in the U.S.

Replace all fossil-fuel fired appliances (e.g. stoves, dryers that use natural gas or propane) with electrified versions (e.g. induction stoves, heat pump dryer)

Fill all cracks with expanding foam or other airtight sealants; best found with a blower door test and used to reduce air leakage.

Apply weatherstripping to all doors and windows to reduce air leakage.

Blow-in or insulation to an attic (or add additional batts).

Use blown-in cellulose without taking the cladding or drywall off, fill cavities with insulation if doing a down-to-the studs renovation, and/or add additional continuous external insulation outside of the studs.

Install an air source heat pump to provide all-electric heating and cooling at high efficiencies. COPs of 3-4 are common in heating mode and COPs of 4-5 are common in cooling mode. Air source units have outdoor units similar to an air conditioner and can be installed either as mini-splits (with individual head units placed in key rooms (as pictured), ducted into a central air system, or used with in-ceiling cassettes.

Provides all-electric heating and cooling using the ground as a heat exchanger. COPs of 4-5 are quite common.

High-efficiency condensing gas boiler or furnace (efficiency is usually 93-97%).

Replace existing windows with high-efficiency double or triple pane windows with the appropriate low-e coatings.

Apply a whole building air sealing solution. If renovating the siding, replace the main house wrap; if not use interior solution such as AeroBarrier.

Provides ventilation air but ensures that the conditioned exhaust air can be used to pre-condition incoming fresh air.

All-electric water heating.with a COP of 3-5. When used in a basement, these units provide the additional benefit of dehumidifying the surrounding space. Units available today run on either 120v or 240v outlets.