Humidity and Moisture Instigating Odors
The smell from your fireplace might increase in the summer due to higher humidity levels. Moisture can cause creosote deposits in your chimney to emit a stronger odor, which can fill your home.
This problem is exacerbated in homes where air conditioning creates negative pressure, pulling more air down the chimney, worsening the scent. Proper ventilation and a yearly chimney cleaning can help reduce these odors.
Animal Intrusions and Debris
Birds or small animals may sometimes enter your chimney, leaving behind nests or debris. These can decompose or create blockages that result in unpleasant smells.
Regular chimney inspections and cap installations can prevent animals from entering and reduce the likelihood of odors from these sources.
Creosote and Soot Buildup
Soot and creosote leftover from the previous winter can also cause your fireplace to smell during the summer. When the chimney isn't in use, these residues can emit strong odors.
Scheduling a chimney sweep before the warmer months can help reduce these smells by removing the buildup before it has a chance to cause problems during the summer.