There are enough cons with a ventless to avoid. From a simple search:

Cons of Ventless Fireplaces

• Indoor Air Quality Risks

• Releases combustion by-products (like carbon dioxide and nitrogen dioxide) directly into the room.

• Not recommended for people with respiratory issues or sensitivities.

• Moisture Buildup

• Can increase humidity levels, potentially leading to mold or mildew over time.

• Oxygen Depletion

• May reduce oxygen levels in tightly sealed rooms; most units include oxygen depletion sensors for safety.

• Legal Restrictions

• Banned or restricted in some states and cities due to safety concerns (e.g., California and Massachusetts).

• Limited Flame Realism

• Flames may appear less natural compared to wood-burning or vented gas fireplaces.

• Not Ideal for Long Use

• Typically recommended for supplemental heating rather than continuous operation.

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