How can electric heating systems affect indoor air quality?

Electric heating systems primarily operate through resistance heating methods, which means they convert electrical energy into heat without relying on combustion processes. This fundamental characteristic of electric heating is significant because combustion-based heating systems, such as gas or oil furnaces, can emit pollutants such as carbon monoxide, nitrogen oxides, and other harmful by-products. These substances can degrade indoor air quality and pose health risks.

In contrast, since electric heating systems do not produce combustion by-products, they contribute to maintaining cleaner indoor air. This absence of pollutants allows for a healthier environment, especially for individuals with respiratory issues or allergies. Therefore, the impact of electric heating on indoor air quality is largely positive, as it minimizes the introduction of harmful substances into the living space, supporting better overall indoor air conditions.

The other options highlight concerns related to heating systems but do not apply to electric systems specifically. For instance, combustion by-products or humidity increases tend to be relevant to non-electric heating systems.