Described herein is a heating system where air is drawn into a system where hot gas is injected into it. The air is then discharged at a regulated temperature into an environment through ductwork to heat environments to elevated temperatures and employing functional modules to further condition the air to humidify, dehumidify, decontaminate with airborne free-radicals, and filtrate in both stationary and portable applications. The system is useful to eradicate pests, disease germs, bacteria, viruses, and mold. The system is also useful in water remediation and comfort heating. The system can be configured to create a parallel path to both heat and dehumidify the airflow blended and discharged at the operator-chosen set-point temperatures.